Smith, John Maynard, author
New Haven Yale University, 1999
Buku Teks
Kelly, Mahlon G., author
Houghton Miffiln, 1975
Buku Teks
Buss, Leo W.
Princeton University Press, 1987
Buku Teks
Ransom, Robert, author
John Wiley & Sons, 1981
Buku Teks
Wilkins, Adam S., author
John Wiley, 1993
Buku Teks