Das Rheinische Braunkohlenrevier. Materialien 4: Braunkohlentagebau und Rekultivierung, von Norbert von der Ruhren (Studiendirektor am Pius-Gynasium in Aachen); Arno Kreus (Oberstudienrat am Pius-Gymnasium in Aachen), Materialien für den Erdkundeunterricht in der Sekundarstufe II, 2. Auflage (1995); Seitenzahl: 87; ISBN: 3-926732-10-5
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