Cita APA (7th ed.)

MURIE, O. J. (1974). A field guide to animal tracks.-- ed.2. Houghton Mifflin co.

Cita Chicago (17th ed.)

MURIE, Olaus Johan. A Field Guide to Animal Tracks.-- Ed.2. Boston: Houghton Mifflin co, 1974.

Cita MLA (9th ed.)

MURIE, Olaus Johan. A Field Guide to Animal Tracks.-- Ed.2. Houghton Mifflin co, 1974.