无法显示我的引文

无法显示我的引文
\documentclass{article}

\usepackage[authoryear]{natbib}

\bibliographystyle{plainnat}


\begin{document}

\section{Background}\label{sec:intro}

Most of the restaurants nowadays are using conventional food-ordering method where the customers place their orders to the waiters and the waitresses directly. This has been time-wasting and paper-wasting \citep*{Bora2012}.The device is connected to the restaurant’s database, all the information of the meals will be shown on the screen. The customers can place the orders by just touch on the screen of the device while the waiters and waitresses can concentrate to serve the customer order. It is believed to be able to improve the restaurant’s services \citep*{Purnama2007}.  

\end{document}

引文的输出

这是我的 bib 文件的示例。

@article{Bora2012,
author = {Bora, Paresh R and Gupta, Eshan},
file = {:C$\backslash$:/Users/Ruby/AppData/Local/Mendeley Ltd./Mendeley 
Desktop/Downloaded/Bora, Gupta - 2012 - APPLICATION ON ORDER MANAGEMENT SYSTEM IN RESTAURANTS.pdf:pdf},
keywords = {android,tablet,touch technology,wi-fi,wireless food ordering system},
number = {2},
pages = {59--62},
title = {{APPLICATION ON ORDER MANAGEMENT SYSTEM IN RESTAURANTS}},
volume = {1},
year = {2012}
}

为什么我的输出会显示这样?

谢谢帮助:) 我已将文件放在同一文件夹中

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