Scarre, Geoffrey
Routledge, 1996
Buku Teks
Amir Mahmudin, author
Edu Indonesia Sinergi, 2005
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah
Mill, John Stuart, author
David Campbell Publisher, 1992
Buku Referensi
Smart, J. J. C. (John Jamieson Carswell), 1920-2012, author
Cambridge University Press, 1973
Buku Teks