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  1.  5
    J. F. Duff (1925). A Study of American Intelligence. The Eugenics Review 17 (2):108.
  2.  2
    J. F. Duff (1926). Genetic Studies of Genius. Vol. I. Mental and Physical Traits of a Thousand Gifted Children. The Eugenics Review 18 (1):45.
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  3.  3
    J. F. Duff (1924). On the Relationship of Health to the Psychical and Physical Characters in School Children. The Eugenics Review 16 (2):148.
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  4.  7
    J. F. Duff (1933). Ancient Education and its Meaning to Us. By J. F. Dobson. Pp. 205. ('Our Debt to Greece and Rome.') London, Etc.: Harrap, 1932. Cloth, 5s. Net. [REVIEW] The Classical Review 47 (02):89-.
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  5. J. F. Duff (1932). An Investigation Into the Relation Between Intelligence and Inheritance. The Eugenics Review 24 (2):143.
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  6. J. F. Duff (1936). Latin in Education Latin: Its Place and Value in Education. By C. W. Valentine, M.A., D. Phil. Pp. X+166. London: University of London Press, 1935. Cloth, 6s. [REVIEW] The Classical Review 50 (01):12-13.
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