APA

Freidberg A., Knutson L. V. & Abercrombie J. (1991). A revision of Sepedonea, a neotropical genus of snail-killing flies (Diptera:Sciomyzidae). Washington, D.C: Smithsonian Institution Press.

Chicago

Freidberg Amnon, Knutson Lloyd V and Abercrombie Jay. 1991. A revision of Sepedonea, a neotropical genus of snail-killing flies (Diptera:Sciomyzidae). Washington, D.C: Smithsonian Institution Press.

Harvard

Freidberg A., Knutson L. V. and Abercrombie J. (1991). A revision of Sepedonea, a neotropical genus of snail-killing flies (Diptera:Sciomyzidae). Washington, D.C: Smithsonian Institution Press.

MLA

Freidberg Amnon, Knutson Lloyd V and Abercrombie Jay. A revision of Sepedonea, a neotropical genus of snail-killing flies (Diptera:Sciomyzidae). Washington, D.C: Smithsonian Institution Press. 1991.