(1967). Mechanical engineering directory and buyers guide 1967-1968. London: The British Mechanical Engineering Federation.
Παραπομπή Chicago StyleMechanical Engineering Directory and Buyers Guide 1967-1968. London: The British Mechanical Engineering Federation, 1967.
Παραπομπή MLAMechanical Engineering Directory and Buyers Guide 1967-1968. London: The British Mechanical Engineering Federation, 1967.
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