SEAMEO Regional Language Centre, 1982
Buku Teks
Gonzalez, Andrew B., author
Oxford University Press, 1984
Buku Teks
Singapore : The SEAMEO Regional English Language Centre
Majalah, Jurnal, Buletin
Richards, Jack C., author
Cambridge University Press, 2015
Buku Teks
edited by Aris Ananta, Armin Bauer, Myo Thant
Institute of South East Asia Studies, 2013
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