Cita APA (7a ed.)

Laetsch, W. M. (1969). The biological perspective: Introductory readings. Little.

Cita Chicago Style (17a ed.)

Laetsch, Watson M. The Biological Perspective: Introductory Readings. Boston: Little, 1969.

Cita MLA (9a ed.)

Laetsch, Watson M. The Biological Perspective: Introductory Readings. Little, 1969.