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1.
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2.
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New York, Duell, Sloan and Pearce [1963]
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3.
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Washington, National Geographic Society [1968]
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4.
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[New York] : Crowell-Collier Press, c1969.
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5.
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New York : Harper, ©1951.
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6.
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New York : Springer, 2005.
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7.
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[New York] New American Library [c1962]
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8.
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New York, Time, inc., c1964.
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9.
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New York, Harper & Row, c1968.
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