APA (7th ed.) Citation

Shirley, G. (1981). Heck Thomas, frontier marshal. University of Oklahoma Press.

Chicago Style (17th ed.) Citation

Shirley, Glenn. Heck Thomas, Frontier Marshal. Norman: University of Oklahoma Press, 1981.

MLA (9th ed.) Citation

Shirley, Glenn. Heck Thomas, Frontier Marshal. University of Oklahoma Press, 1981.