APA (7th ed.) Citation

Whymper, R. (1921). Cocoa and chocolate: Their chemistry and manufacture (2.ed.rev.and enl.). Churchill.

Chicago Style (17th ed.) Citation

Whymper, Robert. Cocoa and Chocolate: Their Chemistry and Manufacture. 2.ed.rev.and enl. London: Churchill, 1921.

MLA (9th ed.) Citation

Whymper, Robert. Cocoa and Chocolate: Their Chemistry and Manufacture. 2.ed.rev.and enl. Churchill, 1921.