Cita APA (7a ed.)

Fries, C., Hibbard, W., & Dunkle, D. E. (1955). Early cenozoic vertebrates in the red conglomerate at Guanajato, México. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Fries, Carl, W. Hibbard, y David E. Dunkle. Early Cenozoic Vertebrates in the Red Conglomerate at Guanajato, México. Washington, D.C: Smithsonian Institution, 1955.

Cita MLA (9a ed.)

Fries, Carl, et al. Early Cenozoic Vertebrates in the Red Conglomerate at Guanajato, México. Smithsonian Institution, 1955.