Artikel Jurnal
van der Veur, Paul W., author
Australian National University Press, 1966
Buku Teks
Jonathan Darling, Helen F. Wilson
Routledge, Taylor & Francis Group, 2016
Buku Teks
edited by Claude Menard
Edward Elgar , 2000
Buku Teks
Clements, Kevin P., author
The Port Nicholson Press, 1988
Buku Teks