Cita APA (7a ed.)

Gould, S. J. (1994). Eight little piggies: Reflections in natural history. W.W. Norton.

Cita Chicago Style (17a ed.)

Gould, Stephen Jay. Eight Little Piggies: Reflections in Natural History. New York [etc.]: W.W. Norton, 1994.

Cita MLA (9a ed.)

Gould, Stephen Jay. Eight Little Piggies: Reflections in Natural History. W.W. Norton, 1994.