Cita APA (7th ed.)

Ayad, G., Toll, J., & Esquinas-Alcazar, J. T. (1980). Maize. IBPGR Secretariat.

Cita Chicago (17th ed.)

Ayad, G., Jane Toll, i J. T. Esquinas-Alcazar. Maize. London: IBPGR Secretariat, 1980.

Cita MLA (8th ed.)

Ayad, G., et al. Maize. IBPGR Secretariat, 1980.