Παραπομπή APA

Greenberg, R., Etterson, M., & Danner, R. M. (2013). Seasonal dimorphism in the horny bills of sparrows. Blackwell Publishing Ltd.

Παραπομπή Chicago Style

Greenberg, Russell, Matthew Etterson, και Raymond M. Danner. Seasonal Dimorphism in the Horny Bills of Sparrows. Blackwell Publishing Ltd, 2013.

Παραπομπή MLA

Greenberg, Russell, Matthew Etterson, και Raymond M. Danner. Seasonal Dimorphism in the Horny Bills of Sparrows. Blackwell Publishing Ltd, 2013.

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