Clark, Charles T.
Ohio South Western , 1969
Buku Teks
Haber, Audrey, author
Addison-Wesley, 1973
Buku Teks
Djarwanto, author
BPFE, 1997
Buku Teks
Gallagher, Charles A.
McGraw-Hill International Book Company, 1980
Buku Teks
Harnett, Donald L., author
Addison-Wesley, 1991
Buku Teks