Last name, First name. “Article Title in Quotations Marks: Use Title Case.” Journal Title in Italics and Title Case Volume.Issue Number (Year of publication): Page numbers. Medium. Date of Access.
Williams, Jennifer D. “Black American Girls in Paris: Sex, Race, and Cosmopolitanism in Andrea Lee’s Sarah Phillips and Shay Youngblood’s Black Girl in Paris.” Contemporary Women’s Writing 9.1 (2015): 1-19. Web. 1 May 2015.
Use the online format for any article that you find online. Note that the date format for the access date is Day Month Year, with longer month names abbreviated. Only May, June, and July are not abbreviated.
It can sometimes be difficult to find page numbers. Always look for a PDF version of the article, which will typically show the page numbers.