Smook B., ^nCopper development association P. B., . (1971). Introduction to copper. Potters Bar: s.e.
Smook B.E, ^nCopper development association Potters Bar^pGB, . 1971. Introduction to copper. Potters Bar: s.e.
Smook B.E, ^nCopper development association Potters Bar^pGB, . Introduction to copper. Potters Bar: s.e. 1971.
