Gaya APA

Walidi, S., S.Pd., L, S, S, D, H, J, P. (2006). Step by Step to Speak English (Cetakan I, 2006). Yogyakarta: PT Citra Aji Parama.

Gaya MLA

Walidi, S.Pd.., S.Pd., Lulu, Sukarta,, S.Pd., Dan, Heru, Joko, Pranantyo,. "Step by Step to Speak English". Cetakan I, 2006 Yogyakarta: PT Citra Aji Parama, 2006. Text.