Peterson, R. T. (1947). A field guide to the birds: Giving field marks of all species found east of the Rockies (2., rev. and enl. ed.). Houghton Mifflin.
Chicago-Zitierstil (17. Ausg.)Peterson, Roger Tory. A Field Guide to the Birds: Giving Field Marks of All Species Found East of the Rockies. 2., rev. and enl. ed. Boston: Houghton Mifflin, 1947.
MLA-Zitierstil (9. Ausg.)Peterson, Roger Tory. A Field Guide to the Birds: Giving Field Marks of All Species Found East of the Rockies. 2., rev. and enl. ed. Houghton Mifflin, 1947.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.