Gaya APA

learning, D, S. (2010). English grammar sistim 24jam / Dra. Sulastri learning (1). Surabaya :: Giri utama,.

Gaya MLA

learning, Dra., Sulastri. "English grammar sistim 24jam / Dra. Sulastri learning". 1 Surabaya :: Giri utama,, 2010. Text.