1. Ueber die Farben der Vogelfedern im Allgemeinen, über das Schillern insbesondere;Altum;Naumannia; Arch. f. die Ornith.,1854
2. A study of the structure of feathers with reference to their taxonomic signifiance;Chandler;Calif. Univ. Pub. Zool.,1916
3. Two factors influencing feathering in chickens;Danforth;Genetics,1929
4. The sequence of plumage and molts of the Passerine birds of New York;Dwight;N. Y. Acad. Sci. Ann.,1900
5. Dietary factors affecting rate and quality of feathers.;Fuller,1941