APA-viite

Gregory, P. H. (1974). Phytophthora disease of cocoa. Longman publishers.

Chicago-tyylinen lähdeviittaus

Gregory, P H. Phytophthora Disease of Cocoa. London: Longman publishers, 1974.

MLA-viite

Gregory, P H. Phytophthora Disease of Cocoa. Longman publishers, 1974.