APA (7th ed.) Citation

Metzger, O. H. (1938). Gold mining in New Mexico. United States Bureau of Mines. Information Circular, 6987, 1.

Chicago Style (17th ed.) Citation

Metzger, O. H. "Gold Mining in New Mexico." United States Bureau of Mines. Information Circular 6987 (1938): 1.

MLA (9th ed.) Citation

Metzger, O. H. "Gold Mining in New Mexico." United States Bureau of Mines. Information Circular, vol. 6987, 1938, p. 1.