Gaya APA

Gibson, C. et al (1999). IELTS practice now : Practice in Listening, Reading, Writing and Speaking for the IELTS Test . Australia: Calusa.

Gaya MLA

Gibson, Carol. et al. "IELTS practice now : Practice in Listening, Reading, Writing and Speaking for the IELTS Test". Australia: Calusa, 1999. Text.