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A manual for writers of research papers, theses, and dissertations : Chicago style for students and researchers by 
Writing about Music by 
The Chicago Manual of Style by Visit http://www.webster.edu/writingcenter for more help with citations and writing.
Since 2000 there has been an effort to assign everything that exists in the digital world such as online articles with a unique number called a Digital Object Identifier or a DOI. The DOI is unique, permanent, and persistent. It remains the same despite changes in URL's or permanent removal from the Internet. If no DOI is present, try the free DOI lookup from CrossRef.
For more information, watch the short video, Citing an article with a DOI and without a DOI (University of Maryland University College). If you have questions, Webster students, faculty and staff should contact the Webster U. Library Reference Department (info in the Help box).
When you cite a full text article retrieved from a Webster University Libraries database, some citation styles require you to cite the database name and/or a URL. Here’s how the University's most-used citation styles address this issue:
Be sure to check the citation guide for how to format the citation required for your assignment.