Drašar, P. (2013) „Norman P. Lieberman: Troubleshooting Vacuum Systems – Steam Turbine Surface Condensers and Refinery Vacuum Towers", Chemické listy, 107(4), s. 319. Dostupné z: http://ww.chemicke-listy.cz/ojs3/index.php/chemicke-listy/article/view/718 (Viděno: 22 červenec 2024).