McMurry, John, author
Brooks/Cole, 1992
Buku Teks
Hart, Harold, 1922-, author
Houghton Mifflin, 1966
Buku Teks
"Pacific Grove: Brooks/Cole Publishing Company, 1998",
Buku Teks
Clayden, Jonathan, author
Oxford University Press, 2001
Buku Teks
Fessenden
Buku Teks