Gaya APA

Arini, Y, D. (2009). A Series of Grammar Let's Study Modals (Ayo Belajar Modal) . Bandung: Pakar Raya Pustaka.

Gaya MLA

Arini, Yuniarti, D.. "A Series of Grammar Let's Study Modals (Ayo Belajar Modal)". Bandung: Pakar Raya Pustaka, 2009. Text.