APA-Zitierstil (7. Ausg.)

Timberlake, P. H. (1975). The North American species of Heterosarus Robertson (Hymenoptera, Apoidea). Univ. of California Press.

Chicago-Zitierstil (17. Ausg.)

Timberlake, Philip H. The North American Species of Heterosarus Robertson (Hymenoptera, Apoidea). Berkeley u.a: Univ. of California Press, 1975.

MLA-Zitierstil (9. Ausg.)

Timberlake, Philip H. The North American Species of Heterosarus Robertson (Hymenoptera, Apoidea). Univ. of California Press, 1975.