Walls and towers

MLA

Qiao, Yun. Walls and Towers : Systems of Defense In Ancient China. New York: CN Times books, 2015.

APA

Qiao, Y. (2015). Walls and towers : systems of defense in ancient China. New York: CN Times books.

Chicago

Qiao, Yun, Walls and Towers: Systems of Defense In Ancient China. New York: CN Times books, 2015.