APA (7th ed.) Citation

Texas. General Land Office, Barrow, J. O., & Clark, A. (1935). Zapata County. General Land Office.

Chicago Style (17th ed.) Citation

Texas. General Land Office, J. O. Barrow, and A. Clark. Zapata County. Austin, Tex.: General Land Office, 1935.

MLA (9th ed.) Citation

Texas. General Land Office, et al. Zapata County. General Land Office, 1935.