Não informado. (2004). SA mining: South African mining, coal, gold, and base minerals. Johnnic Publishing.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Pinegowrie, Africa do Sul: Johnnic Publishing, 2004.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Johnnic Publishing, 2004.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.