APA (7th ed.) Citation

Gordon, R., & Williams, B. J. (2008). Tunnels = terowong. PTS Litera Utama.

Chicago Style (17th ed.) Citation

Gordon, Roderick, and Brian James Williams. Tunnels = Terowong. Kuala Lumpur: PTS Litera Utama, 2008.

MLA (8th ed.) Citation

Gordon, Roderick, and Brian James Williams. Tunnels = Terowong. PTS Litera Utama, 2008.

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