"Typography". The Crystal Reference Encyclopedia (8ed.). New York, NY: Columbia University Press. 2018. Archived from the original on 11 October 2016. Retrieved 2 November 2014– via Credo Reference.
"Typography". The Crystal Reference Encyclopedia (8ed.). New York, NY: Columbia University Press. 2018. Archived from the original on 11 October 2016. Retrieved 2 November 2014– via Credo Reference.
Eckersley, Richard (1994), "Color", Glossary of Typesetting Terms, Chicago guides to writing, editing and publishing, University of Chicago Press, ISBN978-0-226-18371-8, OCLC316234150