A few reference grammars address sentence spacing , as increased spacing between words is punctuation in itself . Most do not . Grammar guides typically cover terminal punctuation and the proper construction of sentences — but not the spacing between sentences . Moreover , many modern grammar guides are designed for quick reference and refer users to comprehensive style guides for additional matters of writing style . For example , the Pocket Idiot 's Guide to Grammar and Punctuation ( 2005 ) point users to style guides such as the MLA Style Manual for consistency in formatting work and for all other " editorial concerns " . The Grammar Bible ( 2004 ) state that " The modern system of English punctuation is by no means simple . A book that cover all the bases would need to be of considerable breadth and weight and anyone interested in such a resource is advised to consult the Chicago Manual of Style . "