Maraist, Frank L., author
West Publishing, 1996
Buku Teks
Saunders, Anthony, author
McGraw-Hill Education, 2015
Buku Teks
Averill, Lawrence H.
West Publishing Company, 1978
Buku Teks
Mennell, Robert L., author
West Publishing, 1994
Buku Teks
Wolfe, Arthur D., author
John Wiley & Sons, 1984
Buku Teks