Gaya APA

Walidin, B., Mardhiah, A. (2019). Smart way to speak English - grammar for speaking (Cet. 2). Jakarta: Nira Wisata Ed..

Gaya MLA

Walidin, Bahrul., Mardhiah, Ainol. "Smart way to speak English - grammar for speaking". Cet. 2 Jakarta: Nira Wisata Ed., 2019. Text.