Corporation, C. B. (1986). The vortex [kasetvideo]. Hong Kong : Educational Film Services.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCorporation, Canadian Broadcasting. The Vortex [kasetvideo]. Hong Kong : Educational Film Services, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCorporation, Canadian Broadcasting. The Vortex [kasetvideo]. Hong Kong : Educational Film Services, 1986.
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