APA

Watkins G. M., . (1981). Compendium of cotton diseases / G. M., Watkins. Minnesota: The American Phytopathological Society.

Chicago

Watkins G M, . 1981. Compendium of cotton diseases / G. M., Watkins. Minnesota: The American Phytopathological Society.

Harvard

Watkins G. M., . (1981). Compendium of cotton diseases / G. M., Watkins. Minnesota: The American Phytopathological Society.

MLA

Watkins G M, . Compendium of cotton diseases / G. M., Watkins. Minnesota: The American Phytopathological Society. 1981.