APA (7th ed.) Citation

Wertmann, P. (2015). Yu the Great. dig into history, 17(9), 20.

Chicago Style (17th ed.) Citation

Wertmann, Patrick. "Yu the Great." Dig into History 17, no. 9 (2015): 20.

MLA (9th ed.) Citation

Wertmann, Patrick. "Yu the Great." Dig into History, vol. 17, no. 9, 2015, p. 20.