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1
IELTS International English Language Testing System :. research reports / IELTS Australia. volume 2 :
Canberra, Australia : IELTS Australia Pty Limited, 1999
144 p. : ill. ; 28 cm.
2
IELTS International English Language Testing System :. research reports 2000 / IELTS Australia. volume 3 :
Canberra, Australia : IELTS Australia Pty Limited, 2000.
160 p. : ill. ; 28 cm.
3
IELTS practice tests : Updated edition/ Michael Garbutt, Kerry O Sullivan.
Sydney : National Centre for English Language Teaching and Research, Macquarie University, 1996.
4
Passport to IELTS / Diana Hopkins, Mark Nettle.
New York : Prential hall, 2003
164 p. : ill. ; 28 cm.