Pentagon

Bu kavram başka kaynaklarda da geçiyor

• Chamber's Twientieth Century Dictionary (1908)
• Chamber's Etymological of the English Language (1895)
• An Illustrated Dictionary of Words Used In Art and Archealogy. (1883)
• A Military Dictionary and Gazetteer (1881)
• Zell's Condensed Dictionary (1879)
• Dictionary of Science, Literature and Art (1854)
• Dictionary of Science, Literature and Art (1842)
• Pantologia (1813)
• A Military Dictionary (1810)
• Pentagon -um — Explanation of Terms Used in Entomology (1906)