Friendship in Hamlet Shakespearean Criticism contains several relevant articles discussing friendship in Hamlet
Volume 83, pages 63 and 83
Volume 129, page 132
Volume 178, pages 249 and 284
Volume 197, pages 3 and 119
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For a particular theme in a Shakespeare play, the Shakespearean Criticism reference set has a "Cumulative Topic Index, by Play." It is organized by play and underneath each play, gives various topics with the volumes and page #'s that refer to that play and that topic. When doing research on themes in Shakespearean Criticism, you may need to look under different headings.
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Library databases are also helpful for finding information on a particular theme in a Shakespeare play. For information specifically on the theme of "friendship," go to the library homepage; select the link for Literary Criticism under Topic Databases on the right-hand column. Start with Literature Resource Centerand key in "Hamlet and Shakespeare and friendship." This search lists 1,000+ articles of literary criticism.