Hrant Arakelian. The History of the Pentagram, Chapter 6 in Mathematics and History of the Golden Section, pp. 207-270, Logos 2014, ISBN 978-5-98704-663-0 (rus.).
Pentagons & Pentagrams(页面存档备份,存于互联网档案馆)new facts about pentagons and pentagrams by Antonio Gutierrez from Geometry Step by Step from the Land of the Incas. Key concept: Menelaus Theorem.