(2019). When whales walked: Journeys in deep time (Widescreen.). PBS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWhen Whales Walked: Journeys in Deep Time. Widescreen. [Arlington, Virginia]: PBS, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWhen Whales Walked: Journeys in Deep Time. Widescreen. PBS, 2019.
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