Não informado. (2009). International Gas Engineering and Management. Institution of Gas Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. International Gas Engineering and Management. London: Institution of Gas Engineers, 2009.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. International Gas Engineering and Management. Institution of Gas Engineers, 2009.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.