In HOLLIS, go to Starts with/Browse and select "Browse by Subject." Enter fugard, and click on the subjects that interest you.
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The 376-volume Dictionary of Literary Biography (shelved in the Literature section of the Loker Reading Room in Widener Library) provides not only biographies, but also critical surveys of the work of writers worldwide. Volume 225 (pictured below) includes a chapter on Athol Fugard, and lists books and journal articles that analyze his writings.