National Geographic Society (U.S.) & Goldberg, S. (2021). The 21st century: Photographs from the image collection. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.) और Susan Goldberg. The 21st Century: Photographs from the Image Collection. Washington, D.C.: National Geographic, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.) और Susan Goldberg. The 21st Century: Photographs from the Image Collection. National Geographic, 2021.
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