APA (7th ed.) Citation

Campbell, W. D., & Thompson, H. A. (1959). Bird-watching as a hobby. Stanley Paul.

Chicago Style (17th ed.) Citation

Campbell, W. D., and H. A. Thompson. Bird-watching as a Hobby. London: Stanley Paul, 1959.

MLA (8th ed.) Citation

Campbell, W. D., and H. A. Thompson. Bird-watching as a Hobby. Stanley Paul, 1959.

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