Agnew, Ralph Palmer
McGraw-Hill Book, 1960
Buku Teks
Blanchard, Paul, author
Brooks/Cole, 1996
Buku Teks
Ross, Shepley L., author
McGraw-Hill, 1984
Buku Teks
Agnew, Ralph Palmer, author
McGraw-Hill, 1160
Buku Teks
Ross, Shepley L., author
Xerox College Publishing, 1964
Buku Teks