Asian mining 81 (1981 : Singapore) & Institution of Mining and Metallurgy. (1981). Asian mining 81: Papers presented at the Asian Mining 81 conference organized by the Institution of Mining and Metallurgy and held in Singapore from 23 to 25 November, 1981. Institution of Mining and Metallurgy.
Παραπομπή σε μορφή Chicago (17η εκδ.)Asian mining 81 (1981 : Singapore) και Institution of Mining and Metallurgy. Asian Mining 81: Papers Presented at the Asian Mining 81 Conference Organized by the Institution of Mining and Metallurgy and Held in Singapore from 23 to 25 November, 1981. London: Institution of Mining and Metallurgy, 1981.
Παραπομπή σε μορφή MLA (9th εκδ.)Asian mining 81 (1981 : Singapore) και Institution of Mining and Metallurgy. Asian Mining 81: Papers Presented at the Asian Mining 81 Conference Organized by the Institution of Mining and Metallurgy and Held in Singapore from 23 to 25 November, 1981. Institution of Mining and Metallurgy, 1981.