For individual playwrights, search by their names in inverted order in the subject index. Use Omni, Browse Search, Library of Congress Subject Heading and insert the name. Look for entries in the subject index that have the subdivision -Criticism and interpretation.
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Encyclopedias and dictionaries remain valuable sources of bio-bibliographical information and concise critical commentary on authors and types of literature.
Try using Omni, Advanced Search and Subject contains: [type a topical word or words] and etiher dictionaries, or, encyclopedias
Bibliographies can provide useful citations to articles, books and other resources on a topic. Older resources cited in printed bibliographies may not be indexed in more modern electronic resources.
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A bibliography focusing upon Australian Aboriginal, Canadian First Nations, and US-American Native Indian cultures and literatures was prepared by Angeline O'Neill (The University of Notre Dame, Australia) and Albert Braz (University of Alberta, Canada) and published in 2011:
O'Neill, Angeline; and Braz, Albert. "Bibliography of Scholarship on Indigenous Literatures and Cultures." CLCWeb: Comparative Literature and Culture 13.2 (2011): <http://dx.doi.org/10.7771/1481-4374.1749>