Knuth, Donald Ervin; Plass, Michael F (1981), "Breaking Paragraphs into Lines", Software: Practice and Experience, 11 (11): 1119–84, doi:10.1002/spe.4380111102, S2CID206508107
mit.edu
massis.lcs.mit.edu
Harris, Robert W. (January 1956), "Keyboard standardization", Western Union Technical Review, 10 (1): 37–42, archived from the original on 2015-08-03, retrieved 2013-04-07.
Knuth, Donald Ervin; Plass, Michael F (1981), "Breaking Paragraphs into Lines", Software: Practice and Experience, 11 (11): 1119–84, doi:10.1002/spe.4380111102, S2CID206508107
unicode.org
Heninger, Andy, ed. (2013-01-25). "Unicode Line Breaking Algorithm"(PDF). Technical Reports. Annex #14 (Proposed Update Unicode Standard): 2. Retrieved 10 March 2015. WORD JOINER should be used if the intent is to merely prevent a line break
web.archive.org
Harris, Robert W. (January 1956), "Keyboard standardization", Western Union Technical Review, 10 (1): 37–42, archived from the original on 2015-08-03, retrieved 2013-04-07.