The new MLA 8th Edition focuses on the concept of "containers" instead of formats.
For example, a book is a container. If it's a print book, then it just has one container. But if it's an e-book, then it has two containers (the e-book itself, and the database or e-reader that you used to access the e-book.)
The same thing happens with articles from journals. The journal is the main container of the article, but if you found the journal article from a database, then the database is an outer container for the journal.
MLA provides examples for using the container structure on their website.
All works-cited entries provide the same types of information, what MLA calls the Core Elements:
It might help to think about how these core elements fit within a who, what, where, when format
Er, Amanda. Matryoshka Dolls. 2010, March 13, Flickr, www.flickr.com/photos/er_amanda/4428053755/.
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