APA-referens

DOUGLAS, M., & NORMAN, D. (2007). FARMING SYSTEMS DEVELOPMENT AND SOIL CONSERVATION.

Chicago-stil citat

DOUGLAS, MALCOLM, och DAVID NORMAN. FARMING SYSTEMS DEVELOPMENT AND SOIL CONSERVATION. DELHI, DAYA PUBLISHING HOUSE, 2007.

MLA-referens

DOUGLAS, MALCOLM, och DAVID NORMAN. FARMING SYSTEMS DEVELOPMENT AND SOIL CONSERVATION. 2007.