Lead Development Association, Zinc Development Association (Great Britain), & International Lead Conference. (1977). Lead and zinc into the 80's: An international conference : report on proceedings 14 to 16 June 1977. [Zinc Development Association] : [Lead Development Association].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLead Development Association, Zinc Development Association (Great Britain), और International Lead Conference. Lead and Zinc into the 80's: An International Conference : Report on Proceedings 14 to 16 June 1977. [London]: [Zinc Development Association] : [Lead Development Association], 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLead Development Association, et al. Lead and Zinc into the 80's: An International Conference : Report on Proceedings 14 to 16 June 1977. [Zinc Development Association] : [Lead Development Association], 1977.