Allcorn, W. (1983). A guide to the fortifications of north-western Europe: How to find examples of gunpowder fortifications in Belgium, northern France, part of Denmark, Luxembourg, the Netherlands and West Germany. Penpaled Books.
Chicago-Zitierstil (17. Ausg.)Allcorn, William. A Guide to the Fortifications of North-western Europe: How to Find Examples of Gunpowder Fortifications in Belgium, Northern France, Part of Denmark, Luxembourg, the Netherlands and West Germany. Liverpool: Penpaled Books, 1983.
MLA-Zitierstil (9. Ausg.)Allcorn, William. A Guide to the Fortifications of North-western Europe: How to Find Examples of Gunpowder Fortifications in Belgium, Northern France, Part of Denmark, Luxembourg, the Netherlands and West Germany. Penpaled Books, 1983.
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