Smil, V. (1993). Global Ecology Environmental Change And Social Flexibility Valclav Smill. Routledge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSmil, Vacent. Global Ecology Environmental Change And Social Flexibility Valclav Smill. Routledge, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSmil, Vacent. Global Ecology Environmental Change And Social Flexibility Valclav Smill. Routledge, 1993.
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