Beebe, John, author
New York Routledge, 2017
Buku Teks
Blackmore, Susan, author
New york, 2005
Buku Teks
Ryrie, Charlie, author
Journet Editions, 1999
Buku Teks
Wilson, Woodrow, author
Prentice-Hall, 1961
Buku Teks
Taylor, John E.
MIT Press, 1999
Buku Teks