Não informado. (1952). Chemical and Process Engineering. Leonard Hill Technical Group.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Chemical and Process Engineering. London: Leonard Hill Technical Group, 1952.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Chemical and Process Engineering. Leonard Hill Technical Group, 1952.
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