Citazione Stile APA (7a Edizione)

WORTMAN, S. (1978). To feed this World: The challenge and the strategy. The Johns Hopkins University.

Citazione stile Chigago Style (17a edizione)

WORTMAN, Sterling. To Feed This World: The Challenge and the Strategy. Baltimore: The Johns Hopkins University, 1978.

Citatione MLA (9a ed.)

WORTMAN, Sterling. To Feed This World: The Challenge and the Strategy. The Johns Hopkins University, 1978.