The rethorical style of indonesian research article introductions: a genre analysis study Safnil
 Artikel Jurnal
Carr, Reg
The academic research library in a decade of change
Chandos, 2007
 Buku Teks
Directory of research in academic year 1996-97
National University of Singapore, [date of publication not identified]
 Buku Referensi
Directory of research in academic year 1995-96
National University of Singapore, [date of publication not identified]
 Buku Referensi
Research perspectives on english for academic purposes
John Flowerdew, Matthew Peacock
Cambridge University Press, 2001
 Buku Teks SO