Capezio, Peter J., 1947-, author
McGraw-Hill, 2010
Buku Teks
Hussey, David E., author
Pergamon Press, 1976
Buku Teks
Dauten, Carl A.
South-Western Publishing Co., 1978
Buku Teks
Valentine, Lloyd M.
Ohio South-Western Pub. , 1991
Buku Teks
Habbel, Rolf W., author
Palgrave Macmillan, 2002
Buku Teks