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.
Citace podle Chicago (17th ed.)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.
Citace podle MLA (9th ed.)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.