editor in chief, Charles A. Harper
McGraw-Hill, 2004
Buku Referensi
Park, William R., author
John Wiley & Sons, 1979
Buku Teks
Tappan, Frances M.
Appletton & Lange , 1998
Buku Teks
Buring, Daniel, author
Cambridge University Press, 2005
Buku Teks
Weil, Andrew, author
Houghton Miffiln, 1998
Buku Teks