Clement, Peter; Harris, Alan; Davis, John (1993). Finches and Sparrows: an Identification Guide. Princeton, New Jersey: Princeton University Press. ISBN0-691-03424-9.
↑Cordero, P。 (1991). "Phenotypes of adult hybrids between House Sparrows Passer domesticus and Tree Sparrow Passer montanus". Bulletin of the British Ornithologists' Club. 111: 44–46。.