* Richard Raiber: Guide to Hitler's Headquarters. "Ab Con 1". Archived from the original on 2007-12-26. Retrieved 2007-12-16., No.19, Special Edition, Battle of Britain International Ltd, 1977, London
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* Richard Raiber: Guide to Hitler's Headquarters. "Ab Con 1". Archived from the original on 2007-12-26. Retrieved 2007-12-16., No.19, Special Edition, Battle of Britain International Ltd, 1977, London