Gaya APA

Lougheed,Ed.D, L. (2021). BARRO'S IELTS ESSENTIAL WORD (Ed.5). Amerka Serikat: Teahers College Columbia University.

Gaya MLA

Lougheed,Ed.D, Lin. "BARRO'S IELTS ESSENTIAL WORD". Ed.5 Amerka Serikat: Teahers College Columbia University, 2021. Text.