Não informado. (2004). Steam and Heating Engineer. Troup Publications.
Chicago-Zitierstil (17. Ausg.)Não informado. Steam and Heating Engineer. London: Troup Publications, 2004.
MLA-Zitierstil (8. Ausg.)Não informado. Steam and Heating Engineer. Troup Publications, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.