Gaya APA

Lubis, R, U., Siregar, I, K. (2021). Speaking For Fun: Learning English Conversation (Cet. 1). Kabupaten Mandailing Natal: Mukhlisina Revolution Center.

Gaya MLA

Lubis, Rica, Umrina., Siregar, Indra, Kurniawan. "Speaking For Fun: Learning English Conversation". Cet. 1 Kabupaten Mandailing Natal: Mukhlisina Revolution Center, 2021. Text.