APA (7th ed.) Citation

Roberts, F. H. H. (1930). Early pueblo ruins in the Piedra district, southwestern Colorado. U.S. Govt. print. off.

Chicago Style (17th ed.) Citation

Roberts, Frank H. H. Early Pueblo Ruins in the Piedra District, Southwestern Colorado. Washington: U.S. Govt. print. off, 1930.

MLA (9th ed.) Citation

Roberts, Frank H. H. Early Pueblo Ruins in the Piedra District, Southwestern Colorado. U.S. Govt. print. off, 1930.