APA (7th ed.) Citation

Freethy, R. (1990). Secrets of bird life: A guide to bird biology (Rev. ed.). Sterling Pub..

Chicago Style (17th ed.) Citation

Freethy, Ron. Secrets of Bird Life: A Guide to Bird Biology. Rev. ed. London: Sterling Pub., 1990.

MLA (9th ed.) Citation

Freethy, Ron. Secrets of Bird Life: A Guide to Bird Biology. Rev. ed. Sterling Pub., 1990.