Bittker, Boris I.
Little, Brown & Co., 1990
Buku Teks
Gaffney, Dennis J.
McGraw-Hill, 1982
Buku Teks
Gaffney, Dennis J.
McGraw-Hill, 1984
Buku Teks
McKee, William S.
Warren,Gorham and Lamont, 1978
Buku Teks
Hudson, David M.
St. Paul, Minn, 1994
Buku Teks