MURIE, O. J. (1974). A field guide to animal tracks.-- ed.2. Houghton Mifflin co.
Lua i Stíl Chicago (17ú heag.)MURIE, Olaus Johan. A Field Guide to Animal Tracks.-- Ed.2. Boston: Houghton Mifflin co, 1974.
Lua MLA (9ú heag.)MURIE, Olaus Johan. A Field Guide to Animal Tracks.-- Ed.2. Houghton Mifflin co, 1974.
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