A good COM Library database for literary criticism is EBSCO: Academic Search Complete.
To get to that database, go to the Library's A-Z databases guide (link below) Click on the Literature page, and on the link to Academic Search Complete.
(Remember to limit your search to Full Text and Scholarly (Peer Reviewed) Journals). After you have completed your search, the articles will be in 'Relevancy' order. You will see that in the upper right of the page. Click on the small arrow next to it and change the sort order to 'Author'. Then you will be able to scroll through the list of articles to select two by the same author.
For more information on using Academic Search Complete, go to the 'How to use Academic Search Complete guide' (link below)