Não informado. (2000). Saturday Review of the Sciences. Saturday Review Associates.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Saturday Review of the Sciences. San Francisco, Calif: Saturday Review Associates, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Saturday Review of the Sciences. Saturday Review Associates, 2000.
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