Cita APA (7a ed.)
Douglas, J. E. (1983). Seed certification: Its role and essential components. International Center for Tropical Agriculture.
Cita Chicago Style (17a ed.)
Douglas, Johnson E. Seed Certification: Its Role and Essential Components. International Center for Tropical Agriculture, 1983.
Cita MLA (9a ed.)
Douglas, Johnson E. Seed Certification: Its Role and Essential Components. International Center for Tropical Agriculture, 1983.
Precaución: Estas citas no son 100% exactas.