Potter, Pitman B.
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Buku Teks
Qureshi, Asif H.
Sweet & Maxwell/Thomson Reuters, 2011
Buku Teks
edited by Eugene Kontorovich
Edward Elgar Publishing, 2016
Buku Teks
Artikel Jurnal
Attard, David Joseph
Clarendon Press, 1987
Buku Teks