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Baillière Tindall & Cassell, 1979
Buku Teks
Puri, Basant K.
Elsevier , 2011
Buku Teks
Arma Diani
Universitas Indonesia, 2012
UI - Tesis Open
Seedhouse, Erik
John Wiley & Sons, 2002
Buku Teks
Gelder, Michael
Oxford University Press, 1983
Buku Teks