Title: Population Biology of Passerine Birds: An Integrated Approach, Author: Jacques Blondel
Title: Ecology and Evolution of Darwin's Finches (Princeton Science Library Edition): Princeton Science Library Edition, Author: Peter R. Grant
Title: Some Adaptations of Marsh-Nesting Blackbirds. (MPB-14), Volume 14, Author: Gordon H. Orians
Title: Darwin's Finches: Readings in the Evolution of a Scientific Paradigm, Author: Kathleen Donohue