Douglas, D. (2010). Understanding language testing. Hodder Education.
Chicago Style (17. basım) AtıfDouglas, Dan. Understanding Language Testing. London: Hodder Education, 2010.
MLA (8th ed.) AtıfDouglas, Dan. Understanding Language Testing. Hodder Education, 2010.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..