Gaya APA

Walidi, S. (2006). Step By Step to Speak English (2006 Cet. 1). Yogyakarta: Citra Aji Parama.

Gaya MLA

Walidi, S.Pd.. "Step By Step to Speak English". 2006 Cet. 1 Yogyakarta: Citra Aji Parama, 2006. Text.