Prassel, Frank R., author
Goodyear, 1979
Buku Teks
Germann, A.C., author
C.C. Thomas, 1971
Buku Teks
Samaha, Joel, author
West Publishing, 1988
Buku Teks
Skolnick, Jerome H., author
John Wiley & Sons, 1966
Buku Teks
Prassel, Frank R.
Goodyear Publishing Company, 1979
Buku Teks