Zeleny, Jindrich, author
Hasta Mitra, 2004
Buku Teks
Lowith, Karl, author
Routledge, 1993
Buku Teks
Raines, John C., author
Teraju, 2003
Buku Teks
edited by Terrell Carver
Cambridge University Press, 1991
Buku Teks
Schneider, Louis, author
McGraw-Hill, 1975
Buku Teks