diff --git a/elegantpaper-en.tex b/elegantpaper-en.tex
index 271dc27..5a79823 100644
--- a/elegantpaper-en.tex
+++ b/elegantpaper-en.tex
@@ -1,6 +1,6 @@
 %!TEX program = pdflatex
 % Full chain: pdflatex -> bibtex -> pdflatex -> pdflatex
-\documentclass[11pt,en,authoryear]{elegantpaper}
+\documentclass[11pt,en,bibstyle=unsrt]{elegantpaper}
 
 \title{ElegantPaper: An Elegant \LaTeX{} Template for Working Papers}
 \author{Ethan DENG \\ Fudan University \and Dongsheng DENG \\ PA Technology}
@@ -57,7 +57,7 @@ Default \LaTeX{} commands and environments are all the same in this template\foo
 
 
 \subsection{Bibliography}
-This template used \hologo{BibTeX} to generate the bibliography, the default bibliography style is  \lstinline{aer} under the option \lstinline{lang=en}. Citation example: ~\cite{en3} used data from a major peer-to-peer lending marketplace in China to study whether female and male investors evaluate loan performance differently. 
+This template used \hologo{BibTeX} to generate the bibliography, the default bibliography style is  \lstinline{aer} under the option \lstinline{lang=en}. Citation example: ~\citep{en1,en2,en3} used data from a major peer-to-peer lending marketplace in China to study whether female and male investors evaluate loan performance differently. 
 
 If you want to use \hologo{BibTeX}, you must create a file named \lstinline{wpref.bib}, and add bib items (from Google Scholar, Mendeley, EndNote, and etc.) to \lstinline{wpref.bib} file, and cite the bibkey in the \lstinline{tex} file. Note that \hologo{BibTeX} has to be added.
 
diff --git a/elegantpaper.cls b/elegantpaper.cls
index 65c9ea5..c289512 100644
--- a/elegantpaper.cls
+++ b/elegantpaper.cls
@@ -25,11 +25,32 @@
 \DeclareVoidOption{authoryear}{\ekv{cite=authoryear}}
 \DeclareVoidOption{super}{\ekv{cite=super}}
 
+\DeclareStringOption[apalike]{bibstyle}
+
 \DeclareDefaultOption{\PassOptionsToClass{\CurrentOption}{article}}
 \ProcessKeyvalOptions*\relax
 \LoadClass{article}
 
+% settings for the hyperref and geometry
+\RequirePackage[
+  left=1in,
+  right=1in,
+  top=1in,
+  bottom=1in,
+  headheight=0pt,
+  headsep=0pt]{geometry}
+\setlength{\headsep}{5pt}
 
+\RequirePackage{hyperref}
+\hypersetup{
+  pdfborder={0 0 0},
+  colorlinks=true,
+  linkcolor={winered},
+  urlcolor={winered},
+  filecolor={winered},
+  citecolor={winered},
+  linktoc=all,
+}
 
 \RequirePackage{amsthm}
 \RequirePackage{amsmath}
@@ -70,19 +91,6 @@
 \definecolor{commentcolor}{RGB}{0,100,0}
 \definecolor{frenchplum}{RGB}{190,20,83}
 
-% settings for the hyperref and geometry
-\RequirePackage{hyperref}
-\hypersetup{
-  pdfborder={0 0 0},
-  colorlinks=true,
-  linkcolor={winered},
-  urlcolor={winered},
-  filecolor={winered},
-  citecolor={winered},
-  linktoc=all,
-}
-\RequirePackage[left=1in, right=1in, top=1in, bottom=1in,headheight=0pt,headsep=0pt]{geometry}
-\setlength{\headsep}{5pt}
 
 % add the \email cmd 
 \newcommand\email[1]{\href{mailto:#1}{\nolinkurl{#1}}}
@@ -175,7 +183,7 @@
   \newcommand{\keywords}[1]{\vskip2ex\par\noindent\normalfont{\bfseries Keywords: } #1}
   \newcommand\figref[1]{{\bfseries Figure~\ref{#1}}}
   \newcommand\tabref[1]{{\bfseries Table~\ref{#1}}}
-  \bibliographystyle{aer}
+  \bibliographystyle{\ELEGANT@bibstyle}
 }{\relax}
 
 \AtBeginEnvironment{verbatim}{\microtypesetup{activate=false}}
diff --git a/figure/ElegantLaTeX.png b/figure/ElegantLaTeX.png
deleted file mode 100644
index 1252e91..0000000
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diff --git a/figure/scatter.pdf b/figure/scatter.pdf
deleted file mode 100644
index b217cdc..0000000
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diff --git a/figure/scatter.py b/figure/scatter.py
deleted file mode 100644
index 576e6b0..0000000
--- a/figure/scatter.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# This file is the source file of the scatter.pdf
-# source page: https://matplotlib.org/gallery/shapes_and_collections/scatter.html
-import numpy as np
-import matplotlib.pyplot as plt
-
-# Fixing random state for reproducibility
-np.random.seed(19680801)
-
-
-N = 50
-x = np.random.rand(N)
-y = np.random.rand(N)
-colors = np.random.rand(N)
-area = (30 * np.random.rand(N))**2  # 0 to 15 point radii
-
-ax = plt.subplot(111)
-ax.scatter(x, y, s=area, c=colors, alpha=0.5)
-
-# Hide the right and top spines
-ax.spines['right'].set_visible(False)
-ax.spines['top'].set_visible(False)
-
-# Only show ticks on the left and bottom spines
-ax.yaxis.set_ticks_position('left')
-ax.xaxis.set_ticks_position('bottom')
-
-plt.savefig('scatter.pdf', transparent=True)
diff --git a/image/tlshell.png b/image/tlshell.png
deleted file mode 100644
index 6cf1c3a..0000000
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