APA (7th ed.) Citation

(2011). IELTS testbuilder (1. publ., 5. [Dr.].). Hueber.

Chicago Style (17th ed.) Citation

IELTS Testbuilder. 1. publ., 5. [Dr.]. [Ismaning]: Hueber, 2011.

MLA (9th ed.) Citation

IELTS Testbuilder. 1. publ., 5. [Dr.]. Hueber, 2011.

Warning: These citations may not always be 100% accurate.