Cita APA (7a ed.)

Gould, S. J. (1993). Eigth little piggies: Reflections in natural history. W.W. Norton.

Cita Chicago Style (17a ed.)

Gould, Stephen Jay. Eigth Little Piggies: Reflections in Natural History. New York: W.W. Norton, 1993.

Cita MLA (8a ed.)

Gould, Stephen Jay. Eigth Little Piggies: Reflections in Natural History. W.W. Norton, 1993.