Mathews, F. S. (1967). Field book of wild birds and their music: A discription of the character and music of birds, intended to assist in the identification of species common in the United States East of the Rocky Mountains. Dover Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Mathews, Ferdinand Schuyler. Field Book of Wild Birds and Their Music: A Discription of the Character and Music of Birds, Intended to Assist in the Identification of Species Common in the United States East of the Rocky Mountains. New York: Dover Publications, 1967.
Παραπομπή σε μορφή MLA (9th εκδ.)Mathews, Ferdinand Schuyler. Field Book of Wild Birds and Their Music: A Discription of the Character and Music of Birds, Intended to Assist in the Identification of Species Common in the United States East of the Rocky Mountains. Dover Publications, 1967.