Chuse, Robert
McGraw-Hill, 1984
Buku Teks
Gillmor, Donald M.
West Publishing Company, 1974
Buku Teks
Newman, Donald J.
Little, Brown & Co., 1966
Buku Teks
Boyd, Maurice
Allyn and Bacon, Inc., 1969
Buku Teks
Day, Donald
David McKay Com., 1962
Buku Teks