(1970). The BEAMA directory of british electrical and allied equipment (4th ed.). London: Pergamon Press.
Παραπομπή Chicago StyleThe BEAMA Directory of British Electrical and Allied Equipment. 4th ed. London: Pergamon Press, 1970.
Παραπομπή MLAThe BEAMA Directory of British Electrical and Allied Equipment. 4th ed. London: Pergamon Press, 1970.
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