Ballard, R. D., & Drew, C. (2021). Into the deep: A memoir from the man who found Titanic. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBallard, Robert D., और Christopher Drew. Into the Deep: A Memoir from the Man Who Found Titanic. Washington, D.C.: National Geographic, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBallard, Robert D., और Christopher Drew. Into the Deep: A Memoir from the Man Who Found Titanic. National Geographic, 2021.
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