this is the format to reference an article

Adamic, Lada and Eytan Adar. 2005. “How to Search a Social Network.” Social Networks 27(3): 187-203. 
remember to alphabetize your References, use a "hanging indent", double space them with no extra space between references, and title the page References.  Click for more here - including detail on Library Day #1 (steps and Library Worksheet)