Stephens, S. (1996). Instructors' manual to accompany discovering the cosmos. University Science Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStephens, Sally. Instructors' Manual to Accompany Discovering the Cosmos. Sausalito, Calif: University Science Books, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रStephens, Sally. Instructors' Manual to Accompany Discovering the Cosmos. University Science Books, 1996.
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