Παραπομπή σε μορφή APA (7η εκδ.)

Wittwer, S. H. (1995). Food, climate, and carbon dioxide: The global environment and world food production. Lewis Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Wittwer, Sylvan Harold. Food, Climate, and Carbon Dioxide: The Global Environment and World Food Production. Boca Raton: Lewis Publishers, 1995.

Παραπομπή σε μορφή MLA (9th εκδ.)

Wittwer, Sylvan Harold. Food, Climate, and Carbon Dioxide: The Global Environment and World Food Production. Lewis Publishers, 1995.