APA

Robbins W. W., . (1931). The botany of crop plants. New York: P.Blakiston's.

Chicago

Robbins Wilfred W, . 1931. The botany of crop plants. New York: P.Blakiston's.

Harvard

Robbins W. W., . (1931). The botany of crop plants. New York: P.Blakiston's.

MLA

Robbins Wilfred W, . The botany of crop plants. New York: P.Blakiston's. 1931.