APA

Hawkes J. G., Williams J. T. & Croston R. P. (1983). A Bibliography of crop genetic resources. Rome: International Board for Plant Genetic Resources.

Chicago

Hawkes J G, Williams J T and Croston R P. 1983. A Bibliography of crop genetic resources. Rome: International Board for Plant Genetic Resources.

Harvard

Hawkes J. G., Williams J. T. and Croston R. P. (1983). A Bibliography of crop genetic resources. Rome: International Board for Plant Genetic Resources.

MLA

Hawkes J G, Williams J T and Croston R P. A Bibliography of crop genetic resources. Rome: International Board for Plant Genetic Resources. 1983.