APA (7th ed.) Citation

Ross, C. S., & Smith, R. L. (1961). Ash-flow tuffs: Their origin, geologic relations, and identification. U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Ross, Clarence S., and Robert L. Smith. Ash-flow Tuffs: Their Origin, Geologic Relations, and Identification. Washington: U.S. Govt. Print. Off, 1961.

MLA (9th ed.) Citation

Ross, Clarence S., and Robert L. Smith. Ash-flow Tuffs: Their Origin, Geologic Relations, and Identification. U.S. Govt. Print. Off, 1961.