APA (7th ed.) Zitazioa
Jakeman, V., & Mcdowell, C. (2004). Step up to ielts: Personal study book with answers. CUP.
Chicago Style (17th ed.) Zitazioa
Jakeman, Vanessa, eta Clare Mcdowell. Step Up to Ielts: Personal Study Book with Answers. Cambridge: CUP, 2004.
MLA (9th ed.) Zitazioa
Jakeman, Vanessa, eta Clare Mcdowell. Step Up to Ielts: Personal Study Book with Answers. CUP, 2004.
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