Niles, Olive S.
Georgia Scott 1984
Buku Teks SO
Walstad, William B.
McGraw-Hill, 2002
Buku Teks SO
Ricki Lewis ... [and others]
McGraw-HIll, 2002
Buku Teks SO
by Mary Ann Frese Witt ... [and others]
D.C. Heath, 1980
Buku Teks SO
Carey, Steven D.
McGraw-HIll, 2000
Buku Teks SO