APA (7th ed.) Citation

Graham, R. H. C., & Gamble, M. (1931). Under seven Congo Kings. Carey Press.

Chicago Style (17th ed.) Citation

Graham, Robert Haldane Carson, and Mercier Gamble. Under Seven Congo Kings. London: Carey Press, 1931.

MLA (8th ed.) Citation

Graham, Robert Haldane Carson, and Mercier Gamble. Under Seven Congo Kings. Carey Press, 1931.

Warning: These citations may not always be 100% accurate.