Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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