1.
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London : Macmillan and Co. Ltd., 1914 (Edinburgh : R. & R. Clark, Ltd.)
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2.
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New York, Humanities Press, 1968.
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3.
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New York, Allerton Book Co., 1922.
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4.
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London : Macmillan & Co., 1903 (Bungay, Suffolk [England] : R. Clay and Sons, Ltd.)
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5.
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London ; New York : Routledge, 2013, c1939.
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6.
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London : Macmillan and Co., Limited, 1914.
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7.
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London : British Society for the Study of Sex Psychology, 1921.
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