Yasso, Warren E.
New York: Holt, Rinehart and Winston, 1965
Buku Teks
Yasso, Warren E.
New York: Holt, Rinehart and Winston, 1965
Buku Teks
Davis, Richard A.
Wm.C. Brown, 1991
Buku Teks
Anderson, Franz E.
Burgess Publishing, 1979
Buku Teks SO
Davis, Richard A.
Wm.C. Brown, 1996
Buku Teks SO