Não informado. Publications of the Earth Physics Branch. Department of Energy, Mines and Resources.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Publications of the Earth Physics Branch. Ottawa: Department of Energy, Mines and Resources.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Publications of the Earth Physics Branch. Department of Energy, Mines and Resources.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.