APA (7th ed.) Citation

Koeniger, G., Koeniger, N., Mardan, M., Otis, G., & Wongsiri, S. (1991). Comparative anatomy of male genital organs in the genus Apis. Elsevier.

Chicago Style (17th ed.) Citation

Koeniger, G., N. Koeniger, Makhdzir Mardan, G. Otis, and S. Wongsiri. Comparative Anatomy of Male Genital Organs in the Genus Apis. Elsevier, 1991.

MLA (9th ed.) Citation

Koeniger, G., et al. Comparative Anatomy of Male Genital Organs in the Genus Apis. Elsevier, 1991.