MLA

Kays, and Stanley J Kays. Cultivated Vegetables of the World: a Multilingual Onomasticon. Wageningen Academic Publishers, 2011.

APA

Kays, K., & Kays, S. J. (2011). Cultivated vegetables of the world: a multilingual onomasticon. Wageningen Academic Publishers.

Chicago

Kays, and Stanley J Kays. Cultivated Vegetables of the World: a Multilingual Onomasticon. : Wageningen Academic Publishers, 2011.