Primary sources can be
Secondary sources are works that
Secondary sources are generally magazines and other non-scholarly sources such as popular books. However, your textbook is a secondary source; it analyzes, evaluates, and interprets information in primary sources.
Smoking Weed Could Cost Teens [Internet] [cited 2015 2/17/2015]. Available from: http://www.huffingtonpost.com/2014/10/29/smoking-weed-could-cost-teens_n_6063600.html
Thanks to Clarrisa Sin at Iolani School for allowing me to use this box.