 A few reference <unk> 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 <unk> 's Guide to Grammar and <unk> ( 2005 ) points 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 ) states that " The modern system of English punctuation is by no means simple . A book that covers 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 . " 
