Tohutoro APA (7th ed.)

Van Beers, W. F. J. (1979). Some nomographs for the calculation of drain spacings. ILRI.

Tohutoru Kātū Chicago (17th ed.)

Van Beers, W. F. J. Some Nomographs for the Calculation of Drain Spacings. Wageningen: ILRI, 1979.

Tohutoro MLA (9th ed.)

Van Beers, W. F. J. Some Nomographs for the Calculation of Drain Spacings. ILRI, 1979.