Cita APA (7th ed.)

Krombein, K. V. (1981). Biosystematic studies of Ceylonese Wasps, XVIII: A monograph of the Philanthidae (Hymenoptera : Sphecoidea). Smithsonian Institution Press.

Cita Chicago (17th ed.)

Krombein, Karl V. Biosystematic Studies of Ceylonese Wasps, XVIII: A Monograph of the Philanthidae (Hymenoptera : Sphecoidea). Washington: Smithsonian Institution Press, 1981.

Cita MLA (9th ed.)

Krombein, Karl V. Biosystematic Studies of Ceylonese Wasps, XVIII: A Monograph of the Philanthidae (Hymenoptera : Sphecoidea). Smithsonian Institution Press, 1981.