APA (7th ed.) Citation

Howard, R. E. (1976). Worms of the earth. Futura Publications.

Chicago Style (17th ed.) Citation

Howard, Robert Ervin. Worms of the Earth. London: Futura Publications, 1976.

MLA (8th ed.) Citation

Howard, Robert Ervin. Worms of the Earth. Futura Publications, 1976.

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