f a sentence and additional measures to perform the same measures are unnecessary.↑ Baugh 2005. p. 200; Cutts 2009. p. 79; Garner 2009. p. 935; Lester 2005; Loberger 2009. p. 158; Stevenson 2005. p. 123; Straus 2009. p. 52; Strumpf. p. 408; Taggart 2009.↑ Baugh 2005. p. 200; Hopper 2004; Stevenson 2005. p. 123.↑ Fogarty 2008. p. 85; Loberger 2009. p. 158.↑ Stevenson 2005. pp. xvi, 123.↑ Strumpf 2004. p. 408.↑ Fogarty 2009. p. 78. Other grammar guides recommend one space for computer users. Some indicate that monospaced text could be double spaced in view of the typewriter tradition. See Lutz and Stevenson 2005. pp. 200–202. The Writing Digest Grammar Desk Reference (2005) indicates that "On typed pages, two blank spaces traditionally follow a sentence-ending period", but that "Many editors ... 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