Wilder
Gramedia, 1956
Buku Teks
Audubon, John James
Macmillan, 1985
Buku Referensi
Scott, Andrew M.
Holt, Rinehart & Winston, 1959
Buku Teks
Sherman, S.
Farrar , 1920
Buku Teks
edited by Jay Schlman, Aubrey Shatter, Rosalie Ehrlich
A Laurel Edition, 1977
Buku Teks