Statler, Oliver
Charles E. Tuttle Co., 1956
Buku Teks SO
Michener, H. Andrew
Harcourt Brace Jovanovich, 1986
Buku Teks SO
Morrow, Theresa
Rockport Pub., 1997
Buku Teks SO
McCredden, Lyn
Oxford University Press, 1992
Buku Teks SO
Dupee, F.W.
Doubleday, 1956
Buku Teks SO