Gaya APA

Oktaberina, L, R. (2011). Progressive English for Tertiary Students (Cet.1). Malang: UIN-MALANG PRESS.

Gaya MLA

Oktaberina, Like, Raskova. "Progressive English for Tertiary Students". Cet.1 Malang: UIN-MALANG PRESS, 2011. Text.