APA (7th ed.) Citation

Free, J. B., & Butler, C. G. (1959). Bumblebees. Collins.

Chicago Style (17th ed.) Citation

Free, John Brand, and Colin G. Butler. Bumblebees. London: Collins, 1959.

MLA (8th ed.) Citation

Free, John Brand, and Colin G. Butler. Bumblebees. Collins, 1959.

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