Lundin, Robert W., author
Macmillan, 1969
Buku Teks
Pittenger, David J., author
McGraw-Hill, 2003
Buku Teks
Ghali, A., author
Intext Educational Publishers , 1972
Buku Teks
Hemisphere , 1991
Buku Teks
Games, Paul A., author
McGraw-Hill, 1967
Buku Teks