^ abEngineering News-record. 17-23. 253. McGraw-Hill Publishing Company. (2004). pp. 7–. https://books.google.com/books?id=oaAkAQAAMAAJ. "SPX Sells Bomag and Hypac While Ingersoll-Rand Sells Dresser Publicly owned SPX Corp., Charlotte, N.C., has agreed to sell its premium- priced Bomag and Hypac brands of road- building machinery to privately owned Fayat ..."
^ (German) Der Tiefbau. (1970). pp. 1024–. https://books.google.com/books?id=hFpVAAAAYAAJ. "Karl H. Schwamborn. geschäftsführender Gesellschafter der Bomag. wird eine wesentliche Beteiligung an Koehring ... Kreis Biedenkopf/Lahn, studierte er von 1952 bis 1957 Maschinenbau an der Technischen Hochschule in Darmstadt."
^New Civil Engineer. T. Telford. (1976). pp. 25–. https://books.google.com/books?id=JoI7AAAAMAAJ. "Bomag's compact compactor Bomag, market leader in the UK for double drum vibrating rollers, is breaking into the ... vibratory field and around 50,000 units have been sold since Karl Heinz Schwamborn formed the company in 1957."
^10-K Transcript. (1975). pp. 237–. https://books.google.com/books?id=HqQuAQAAIAAJ. "Mr. Schwamborn was the President of Bopparder Maschlnenbaugeeellschaft mbH (BOMAG) of Boppard, West Germany, a company he founded in 1957 until its acquisition by registrant in 1970. He continued as President of Bomag until its ..."
^ (German) Der Tiefbau. 11. (1969). pp. 1097–. https://books.google.com/books?id=JmFVAAAAYAAJ. "So bezog die Bomag im Frühjahr 1969 im Industriegelände Boppard-Hellerwald neue Fertigungshallen und ein neues Verwaltungsgebäude. Der Neubau war erforderlich geworden, um die Produktion der ständig ansteigenden Nachfrage ..."