(Chicago Manual of Style 14.243-14.246)
Author of Entry, "Name of Entry," Title or Description of Blog (blog), URL.
1. Andrew Cannizzaro, “Presidents’ Day: America’s Need for Three Day Weekends,” Bio Blog, February 14, 2014, http://www.biography.com/blog/presidents-day-video.
Author of Entry. "Name of Entry." Title or Description of Blog (blog). URL.
Cannizzaro, Andrew. “Presidents’ Day: America’s Need for Three Day Weekends.” Bio Blog. February 14, 2014. http://www.biography.com/blog/presidents-day-video.
After title or description or blog, the word blog should appear in parentheses unless it is included in the name like the example above.
"Citations of blog entries are generally relegated to the notes; a frequently cited blog , however, may be included in the bibliography." (CMS 14.246)