Audubon, John James
Macmillan, 1985
Buku Referensi
Wilder
Gramedia, 1956
Buku Teks SO
edited by Yvonne Yazbeck Haddad
Oxford University Press, 1991
Buku Teks SO
Scott, Andrew M.
Holt, Rinehart & Winston, 1959
Buku Teks SO
edited by Jay Schlman, Aubrey Shatter, Rosalie Ehrlich
A Laurel Edition, 1977
Buku Teks SO