西琴 & 宋易. (2010). 当时间开始: When time began. 重庆出版社.
Chicago Style (17th ed.) Citation西琴 and 宋易. 当时间开始: When Time Began. 重庆出版社, 2010.
MLA (8th ed.) Citation西琴 and 宋易. 当时间开始: When Time Began. 重庆出版社, 2010.
Warning: These citations may not always be 100% accurate.