Sarma, S. (1978). Vallathol: A centenary perspective. International Vallathol Birth Centenary Festival Committee.
शिकागो स्टाइल उद्धरणSarma, S. Vallathol: A Centenary Perspective. International Vallathol Birth Centenary Festival Committee, 1978.
एमएलए उद्धरणSarma, S. Vallathol: A Centenary Perspective. International Vallathol Birth Centenary Festival Committee, 1978.
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