Grubb, T. C. (2006). Ptilochronology: Feather time and the biology of birds. Oxford University Press.
Chicago-čujuhus (17. p.)Grubb, Thomas C. Ptilochronology: Feather Time and the Biology of Birds. Oxford: Oxford University Press, 2006.
MLA-čujuhus (9. p.)Grubb, Thomas C. Ptilochronology: Feather Time and the Biology of Birds. Oxford University Press, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.