APA (7th ed.) Citation

Walidi. (2006). Step by Step to Speak English. Citra Aji Parama.

Chicago Style (17th ed.) Citation

Walidi. Step by Step to Speak English. Citra Aji Parama, 2006.

MLA (8th ed.) Citation

Walidi. Step by Step to Speak English. Citra Aji Parama, 2006.

Warning: These citations may not always be 100% accurate.