APA

Stiles F. G., .When black plus white equals gray: the nature of variation in the variable seedeater complex (<Emberizinae: Sporophila>). : .

Chicago

Stiles F Gary, .When black plus white equals gray: the nature of variation in the variable seedeater complex (<Emberizinae: Sporophila>). : .

Harvard

Stiles F. G., .When black plus white equals gray: the nature of variation in the variable seedeater complex (<Emberizinae: Sporophila>). : .

MLA

Stiles F Gary, .: . .