APA (7th ed.) Citation

Crooke, A. C., Butt, W. R., & Bertrand, P. V. Clinical trial of human gonadotrophins. Periodica.

Chicago Style (17th ed.) Citation

Crooke, A. C., Wilfrid R. Butt, and P. V. Bertrand. Clinical Trial of Human Gonadotrophins. Copenhagen: Periodica.

MLA (9th ed.) Citation

Crooke, A. C., et al. Clinical Trial of Human Gonadotrophins. Periodica.