APA (7th ed.) Citation

Fitter, R. (1952). Collins pocket guide to British birds / by R.S.R. Fitter. Collins.

Chicago Style (17th ed.) Citation

Fitter, Richard. Collins Pocket Guide to British Birds / by R.S.R. Fitter. Collins, 1952.

MLA (9th ed.) Citation

Fitter, Richard. Collins Pocket Guide to British Birds / by R.S.R. Fitter. Collins, 1952.

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