BALASUBRAMANIAN, P. (2013). TRIPS IN TIME A TEXTBOOK FOR ICSE HISTORY AND CIVICS - BOOK 1. CAMBRIDGE UNIVERSITY PRESS.
芝加哥风格引文BALASUBRAMANIAN, PREMA. TRIPS IN TIME A TEXTBOOK FOR ICSE HISTORY AND CIVICS - BOOK 1. NEW DELHI: CAMBRIDGE UNIVERSITY PRESS, 2013.
MLA引文BALASUBRAMANIAN, PREMA. TRIPS IN TIME A TEXTBOOK FOR ICSE HISTORY AND CIVICS - BOOK 1. CAMBRIDGE UNIVERSITY PRESS, 2013.
警告：这些引文格式不一定是100％准确.