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. Corvallis: Agricultural Experiment Station, Oregon State University.
Citación estilo ChicagoStephen, William Procuronoff, George Edward Bohart, y Philip 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 MLAStephen, William Procuronoff, George Edward Bohart, y Philip 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.