APA (7th ed.) Citation

Walker, W. R. (1989). Guidelines for designing and evaluating surface irrigation systems. Food and Agriculture Organization of the United Nations.

Chicago Style (17th ed.) Citation

Walker, Wynn R. Guidelines for Designing and Evaluating Surface Irrigation Systems. Rome: Food and Agriculture Organization of the United Nations, 1989.

MLA (9th ed.) Citation

Walker, Wynn R. Guidelines for Designing and Evaluating Surface Irrigation Systems. Food and Agriculture Organization of the United Nations, 1989.