Gaya APA

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

Gaya MLA

Walidi, . "Step By Step To Speak English". Cet. 1 Yogyakarta: PT. Citra Aji Parama, 2006. Text.