APA (7th ed.) Citation

Mullin, R. N. (1967). The boyhood of Billy the Kid. Texas Western Press.

Chicago Style (17th ed.) Citation

Mullin, Robert N. The Boyhood of Billy the Kid. El Paso, Tex: Texas Western Press, 1967.

MLA (9th ed.) Citation

Mullin, Robert N. The Boyhood of Billy the Kid. Texas Western Press, 1967.

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