Siropolis, Nicholas C., author
Houghton Miffiln, 1977
Buku Teks
Weston, Martin
Oxford, 1991
Buku Teks
Surrency, Erwin C.
An Oceana Publication, 1966
Buku Teks
Darmstadter, Howard, author
ABA Publishing, 2008
Buku Teks
Miller, Edwin L., author
John Wiley & Sons, 2008
Buku Teks