Sen, S. (1988). May day and eight hours' struggle in India: A political history. K.P. Bagchi.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSen, Sukomal. May Day and Eight Hours' Struggle in India: A Political History. K.P. Bagchi, 1988.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSen, Sukomal. May Day and Eight Hours' Struggle in India: A Political History. K.P. Bagchi, 1988.
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