(1976). Mining methods: Proceedings of the symposium on mining methods, Harrogate, 30th October-1st November, 1974. London: Institute on Mining Engineers.
Παραπομπή Chicago StyleMining Methods: Proceedings of the Symposium On Mining Methods, Harrogate, 30th October-1st November, 1974. London: Institute on Mining Engineers, 1976.
Παραπομπή MLAMining Methods: Proceedings of the Symposium On Mining Methods, Harrogate, 30th October-1st November, 1974. London: Institute on Mining Engineers, 1976.
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