Butsch, R. S., & Homphrey, P. S. (1958). The anatomy of the labrador duck, camptorhynchus labradorius (gmelin). With five plates. Smithsonian Institution.
Cita Chicago Style (17a ed.)Butsch, Robert S., y Philips S. Homphrey. The Anatomy of the Labrador Duck, Camptorhynchus Labradorius (gmelin). With Five Plates. Washington: Smithsonian Institution, 1958.
Cita MLA (8a ed.)Butsch, Robert S., y Philips S. Homphrey. The Anatomy of the Labrador Duck, Camptorhynchus Labradorius (gmelin). With Five Plates. Smithsonian Institution, 1958.
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