Gaya APA
Purba, Y. (2019).
English vacabulary booster : toefl, toeic, IELTS, GRE & daily conversation .
Yogyakarta:
Outre.
Gaya MLA
Purba, Y.Sahana.
"English vacabulary booster : toefl, toeic, IELTS, GRE & daily conversation".
Yogyakarta:
Outre,
2019.
Text.