APA

Hawkes J. G., . (1983). The diversity of crop plants. Cambridge: Harvard University Press.

Chicago

Hawkes John Gregory, . 1983. The diversity of crop plants. Cambridge: Harvard University Press.

Harvard

Hawkes J. G., . (1983). The diversity of crop plants. Cambridge: Harvard University Press.

MLA

Hawkes John Gregory, . The diversity of crop plants. Cambridge: Harvard University Press. 1983.