Chapman, F. M. What Bird is That? A Pocket Museum of the Land Birds of the Eastern United States Arranged According to Season.
Chicago-referens (17:e uppl.)Chapman, Frank M. What Bird Is That? A Pocket Museum of the Land Birds of the Eastern United States Arranged According to Season.
MLA-referens (9:e uppl.)Chapman, Frank M. What Bird Is That? A Pocket Museum of the Land Birds of the Eastern United States Arranged According to Season.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.