Johson, David B.
Grove Brooks/Cole, 1999
Buku Teks
Calvert, James
McGraw-Hill, 1994
Buku Teks
Lial, Margaret L.
Addison-Wesley, 2005
Buku Teks SO
by Robert V. Hog ... [and others]
Cummings, 1974
Buku Teks
Budnick, Frank S.
McGraw-Hill, 1985
Buku Teks