APA (7th ed.) Citation

Grimmett, R., Inskipp, C., & Inskipp, T. (1999). Pocket guide to the birds of the Indian subcontinent. Helm.

Chicago Style (17th ed.) Citation

Grimmett, Richard, Carol Inskipp, and Tim Inskipp. Pocket Guide to the Birds of the Indian Subcontinent. London: Helm, 1999.

MLA (9th ed.) Citation

Grimmett, Richard, et al. Pocket Guide to the Birds of the Indian Subcontinent. Helm, 1999.