Gaya APA

Yufrizal, H. (2021). An introduction to second language acquisition:a text book for esl learners and english teachers/Hery Yufrizal (Ed. 1, Cet. 1.). Depok: Rajawali Pers.

Gaya MLA

Yufrizal, Hery. "An introduction to second language acquisition:a text book for esl learners and english teachers/Hery Yufrizal". Ed. 1, Cet. 1. Depok: Rajawali Pers, 2021. Text.