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| 1. |
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Audubon's Birds of America
Roger Tory Peterson, Virginia Marie Peterson
Inbunden. Abbeville Press Inc.,U.S., USA, 2005.
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| 2. |
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A Field Guide to Feeder Birds, Eastern and Central North America
Roger Tory Peterson, Virginia Marie Peterson, Roger Troy Peterson
Häftad. Houghton Mifflin (Trade), USA, 2001.
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| 3. |
|
Audubons Birds of America
Roger Tory Peterson, Virginia Marie Peterson
Inbunden. Abbeville Press Inc.,U.S., USA, 2023.
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