Purushothaman,P O. (1988). Tharathamyasahithyam: Thathvavum prasakthiyum. State Institute of languages.
Chicago Style aipamenaPurushothaman,P O. Tharathamyasahithyam: Thathvavum Prasakthiyum. Trivendrum: State Institute of languages, 1988.
MLA aipamenaPurushothaman,P O. Tharathamyasahithyam: Thathvavum Prasakthiyum. State Institute of languages, 1988.
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