Winchester, A.M.
Hoghton Mifflin, 1959
Buku Teks
Cummings, Michael R.
Brooks/Cole, Cengage Learning, 2011
Buku Teks
Montagu, Ashley, 1905-1999
Word Publishing, 1995
Buku Teks
James J. Nora [and others]
Lea & Febiger , 1993
Buku Teks SO
Padilla, Michael J.
Prenhallindo, 2003
Buku Referensi