Citazione Stile APA (7a Edizione)

Hexem, R. W., & Heady, E. O. (1978). Water production functions for irrigated agriculture. Iowa State University Press.

Citazione stile Chigago Style (17a edizione)

Hexem, Roger W., e Earl Orel Heady. Water Production Functions for Irrigated Agriculture. Ames: Iowa State University Press, 1978.

Citatione MLA (9a ed.)

Hexem, Roger W., e Earl Orel Heady. Water Production Functions for Irrigated Agriculture. Iowa State University Press, 1978.