APA (7th ed.) Citation

FELTWELL, J. (1986). Butterflies. Facts On File Publications.

Chicago Style (17th ed.) Citation

FELTWELL, John. Butterflies. Facts On File Publications, 1986.

MLA (8th ed.) Citation

FELTWELL, John. Butterflies. Facts On File Publications, 1986.

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