Hero of Alexandria, Horoi ton geometrias onomaton, 135, 14: «Thus, since a cylindrical column would, when looked at, seem irregularly narrower in the middle, he makes this part of it wider» (translation given by Ralph Hancock, The Department of Greek and Latin at The Ohio State University) [1] [Архівовано 7 листопада 2007 у Wayback Machine.]
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Vitruvius. On Architecture. 3.3.13. Архів оригіналу за 28 квітня 2019. Процитовано 21 квітня 2016.
Hero of Alexandria, Horoi ton geometrias onomaton, 135, 14: «Thus, since a cylindrical column would, when looked at, seem irregularly narrower in the middle, he makes this part of it wider» (translation given by Ralph Hancock, The Department of Greek and Latin at The Ohio State University) [1] [Архівовано 7 листопада 2007 у Wayback Machine.]
