Shirley, David A., author
Holt Rinehart & Winston, 1964
Buku Teks
Pine, Stanley H., author
McGraw-Hill , 1987
Buku Teks
Morrison, Robert Thornton, author
Prentice-Hall, 1992
Buku Teks
Carey, Francis A., 1937-, author
McGraw-Hill, 1992
Buku Teks
McMurry, John, author
Brooks/Cole, 1992
Buku Teks