Hindmarsh, Roland
Cambridge University Press , 1980
Buku Teks
Newman, Daniel, author
Routledge, 2007
Buku Referensi
Lane, Edward William, author
Frederick Ungar Publishing, 1956
Buku Referensi
Peters, Pam, author
Cambridge University Press, 2006
Buku Referensi
Ceramella, Nick, author
Cambridge University Press, 2008
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