Cita APA (7a ed.)

Etulain, R. W. (2020). Billy the Kid: A reader's guide. University of Oklahoma Press.

Cita Chicago Style (17a ed.)

Etulain, Richard W. Billy the Kid: A Reader's Guide. Norman: University of Oklahoma Press, 2020.

Cita MLA (9a ed.)

Etulain, Richard W. Billy the Kid: A Reader's Guide. University of Oklahoma Press, 2020.