↑ Phinney, Thomas. "Sans Serif: Gothic and Grotesque". Typography. Showker, Inc., TA. Showker Graphic Arts & Design. สืบค้นเมื่อ 1 February 2013.
↑ Merriam-Webster's Manual for Writers and Editors, (Springfield, 1998) p. 329.
↑ Wheildon, Colin (1995). Type and Layout: How Typography and Design Can Get your Message Across – Or Get in the Way. Berkeley: Strathmoor Press. pp. 57, 59–60. ISBN0-9624891-5-8.
↑ Kathleen Tinkel, "Taking it in: What makes type easy to read", adobe.comArchived 2012-10-19 at the Wayback Machine. Accessed 28 December 2010. p. 3.
