1.
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Hillside, N.J., U.S.A. : Enslow Publishers, c1986.
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2.
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New York, Atheneum, 1971.
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3.
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Englewood Cliffs, N.J., Prentice-Hall c1972.
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4.
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New York, Lothrop, Lee & Shepard [1973]
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5.
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New York, John Day Co. [1969]
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6.
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New York, Lothrop, Lee & Shepard Co. [1972]
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7.
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Englewood Cliffs, N.J., Prentice-Hall [1970]
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8.
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9.
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10.
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