Não informado. (1976). RAILWAY ENGINEER. Mechanical Engineering Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. RAILWAY ENGINEER. London: Mechanical Engineering Publications, 1976.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. RAILWAY ENGINEER. Mechanical Engineering Publications, 1976.
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