Swan, Michael
The new cambridge english course 3
Cambridge University Press, 1992
 Buku Teks SO
Sharpe, Pamela J.
How to prepare for the TOEFL (Test Of English as a Foreign Language)
Barron's, 2001
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Sullivan, Patricia Noble
ARCO everything you need to score high on the TOEFL : test of english as a foreign language
Macmillan Company, 1997
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Cambridge IELTS 7: examination papers from University of Cambridge ESOL examinations: english for speakers of other language
Cambridge University Press, 2009
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Cambridge IELTS 6 : examination papers from University of Cambridge ESOL examinations
Cambridge University Press, 2007
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