Schoenman, Ralph, author
Veritas Press, 1988
Buku Teks
Verschuur, Gerrit L., author
Oxford University Press, 1993
Buku Teks
Cohen, Martin, author
Blackwell Publishing, 2008
Buku Teks
Novosti press , 1970
Buku Teks
Cole, John W., author
Academic Press, 1974
Buku Teks