Cita APA (7a ed.)
Douglas, J. E. (1982). Practices used by small farmers in selecting and maintaining their own seed. International Center for Tropical Agriculture.
Cita Chicago Style (17a ed.)
Douglas, Johnson E. Practices Used by Small Farmers in Selecting and Maintaining Their Own Seed. International Center for Tropical Agriculture, 1982.
Cita MLA (9a ed.)
Douglas, Johnson E. Practices Used by Small Farmers in Selecting and Maintaining Their Own Seed. International Center for Tropical Agriculture, 1982.
Precaución: Estas citas no son 100% exactas.