APA (7th ed.) Citation

Brock, P., & Young, N. (1999). Pacifism in the twentieth century.

Chicago Style (17th ed.) Citation

Brock, Peter, and Nigel Young. Pacifism in the Twentieth Century. 1999.

MLA (9th ed.) Citation

Brock, Peter, and Nigel Young. Pacifism in the Twentieth Century. 1999.

Warning: These citations may not always be 100% accurate.