Hockett, Homer Carey
Macmillan, 1963
Buku Teks
Roth, Audrey J., author
Wadsworth, 1995
Buku Teks
Ferre, John P., author
Charles E. Merrill Pub. Co., 1983
Buku Referensi
Lesikar, Raymond V. (Raymond Vincent), author
Dow Jones-Irwin , 1974
Buku Teks
Lerner, Marcia, author
Random House, 2001
Buku Teks