Cita APA (7a ed.)

Helgen, J. C. (2012). Peril in the Ponds: Deformed Frogs, Politics, and a Biologist's Quest. University of Massachusetts Press.

Cita Chicago Style (17a ed.)

Helgen, Judith Cairncross. Peril in the Ponds: Deformed Frogs, Politics, and a Biologist's Quest. Amherst: University of Massachusetts Press, 2012.

Cita MLA (8a ed.)

Helgen, Judith Cairncross. Peril in the Ponds: Deformed Frogs, Politics, and a Biologist's Quest. University of Massachusetts Press, 2012.