Gaya APA

Widarso, W., Mariani, L. (2011). Complete english grammar / Wishnubroto Widarso & Lulut Mariana (Cet.13). Yogyakarta: Kanisius.

Gaya MLA

Widarso, Wishnubroto., Mariani, Lulut. "Complete english grammar / Wishnubroto Widarso & Lulut Mariana". Cet.13 Yogyakarta: Kanisius, 2011. Text.