Cita APA

Roberts, F. H. H. 1., & Roberts, F. H. H. 1. (1930). Early pueblos ruins in the piedra district, South-Western Colorado. Washington: U.S.G.P.O..

Citación estilo Chicago

Roberts, Frank Harold Hanna 1897-1966, y Frank Harold Hanna 1897-1966 Roberts. Early Pueblos Ruins in the Piedra District, South-Western Colorado. Washington: U.S.G.P.O., 1930.

Cita MLA

Roberts, Frank Harold Hanna 1897-1966, y Frank Harold Hanna 1897-1966 Roberts. Early Pueblos Ruins in the Piedra District, South-Western Colorado. Washington: U.S.G.P.O., 1930.