Gaya APA

Hasibuan, K., Sutarmo, . (2023). English as a Foreign Language (EFL) (1 cet 1). : Raja Grafindo Persada.

Gaya MLA

Hasibuan, Kalayo., Sutarmo, . "English as a Foreign Language (EFL)". 1 cet 1 : Raja Grafindo Persada, 2023. Text.