APA (7th ed.) Zitazioa
Johnstone, P., Mandryk, J., & Johnstone, R. (2001). Operation world. Paternoster Lifestyle.
Chicago Style (17th ed.) Zitazioa
Johnstone, Patrick, Jason Mandryk, eta Robyn Johnstone. Operation World. Cumbria, UK :: Paternoster Lifestyle, 2001.
MLA (9th ed.) Zitazioa
Johnstone, Patrick, et al. Operation World. Paternoster Lifestyle, 2001.
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