... now prefer only a single space" after terminal punctuation. The Blue Book of Grammar and Punctuation (2009) echoes this opinion in that computer users should "use only one space", and with "some typewriters and word processors, [users should] follow ending punctuation with two spaces when using fixed-pitch fonts". See also Straus 2009 . p. 52. ^ Russin and Downs 2003 . p. 17. The authors state that "Courier 12-point is preferred, although New York, Bookman, and Times will do". Allen 2001 Moira Anderson Allen suggests that publishers are more interested in readable fonts as opposed to maintaining a fixed-width font standard. ^ Tinker 1963 . pp. 50, 108, 128. A useful example is the Helvetica font, an ubiquitous font that is considered to be visually pleasing in the construction and viewing of its characters, but has been found to impair reading effectiveness ( readability ). See Squire 2006 . p. 36. Allen, Moira Anderson (2001). "A Quick Guide to Manuscript Format" . Retrieved 22 October 2013 . "This article originally appeared on Inkspot. Editor of editor of Writing-World.com, the author has written more than 300 published articles. Her books on writing include "Starting Your Career as a Freelance Writer (2003, 2005 reprint)", "The Writer's Guide to Queries, Pitches and Proposals (2001)" and "Writing to Win: The Colossal Guide to Writing Contests (2010)"." University of Chicago Press (1911). Manual of Style: A Compilation of Typographical Rules Governing the Publications of the University of Chicago, with Specimens of Types Used at