Bolis, J. L., & Bekkala, J. A. (1986). Iron ore availability--market economy countries: A minerals availability appraisal. U.S. Dept. of the Interior, Bureau of Mines.
Citazione stile Chigago Style (17a edizione)Bolis, Judith L., e James A. Bekkala. Iron Ore Availability--market Economy Countries: A Minerals Availability Appraisal. [Pittsburgh]: U.S. Dept. of the Interior, Bureau of Mines, 1986.
Citatione MLA (9a ed.)Bolis, Judith L., e James A. Bekkala. Iron Ore Availability--market Economy Countries: A Minerals Availability Appraisal. U.S. Dept. of the Interior, Bureau of Mines, 1986.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.