Gaya APA

Gould, S, J. (1993). Eight little piggies: Reflections in natural history. . New York dsl: New York dsl WW Norton & Co.

Gaya MLA

Gould, Stephen, Jay. "Eight little piggies: Reflections in natural history. ". New York dsl: New York dsl WW Norton & Co, 1993. Buku.