This revised 1940 classic makes a handy companion to the Chicago Manual of Style for Canadian writers. I have the 1986 edition, but the more recent 17th edition was published in 2013. It is also available as a digital reference.
Canadian Press Stylebook, edited by Bob Taylor. Toronto: The Canadian Press, 1986, ISBN 0-920009-01-8.
Canadian Press Stylebook 17th Edition, edited by Patti Tasko. Toronto: The Canadian Press, 2013, ISBN 0920009506.