APA (7th ed.) Citation

Sherbourn, R. H., Carter, C. C., & Brentnall, H. C. (1949). An introductory book. Blackwell.

Chicago Style (17th ed.) Citation

Sherbourn, R. H., C. C. Carter, and H. C. Brentnall. An Introductory Book. Oxford: Blackwell, 1949.

MLA (9th ed.) Citation

Sherbourn, R. H., et al. An Introductory Book. Blackwell, 1949.