Peterson, R. T. (1941). A field guide to western birds. Houghton Mifflin.
Chicago-čujuhus (17. p.)Peterson, Roger Tory. A Field Guide to Western Birds. Houghton Mifflin, 1941.
MLA-čujuhus (9. p.)Peterson, Roger Tory. A Field Guide to Western Birds. Houghton Mifflin, 1941.
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