Gaya APA

Dammert, A, J., ckhabra, J, G. (1990). The Lead and Zinc Industries Long - Terms Prospects . : The World Bank.

Gaya MLA

Dammert, Alpedo, J.., ckhabra, Jabir, G.S.. "The Lead and Zinc Industries Long - Terms Prospects". : The World Bank, 1990. Text.