Cita APA (7a ed.)

Stephen, W. P., Bohart, G. E., & Torchio, P. F. (1969). The biology and external morphology of bees: With a synopsis of the genera of northwestern America. Agricultural Experiment Station, Oregon State University.

Cita Chicago Style (17a ed.)

Stephen, W. P., G. E. Bohart, y P. F. Torchio. The Biology and External Morphology of Bees: With a Synopsis of the Genera of Northwestern America. Corvallis: Agricultural Experiment Station, Oregon State University, 1969.

Cita MLA (8a ed.)

Stephen, W. P., et al. The Biology and External Morphology of Bees: With a Synopsis of the Genera of Northwestern America. Agricultural Experiment Station, Oregon State University, 1969.