Cita APA (7a ed.)
Schep, J., Pardey, P. G., & Roseboom, H. (1988). DREF: ISNAR's Literature Reference Database System Version 3.1. International Service for National Agricultural Research.
Cita Chicago Style (17a ed.)
Schep, Johan, Philip G. Pardey, y Han Roseboom. DREF: ISNAR's Literature Reference Database System Version 3.1. International Service for National Agricultural Research, 1988.
Cita MLA (9a ed.)
Schep, Johan, et al. DREF: ISNAR's Literature Reference Database System Version 3.1. International Service for National Agricultural Research, 1988.
Precaución: Estas citas no son 100% exactas.