(EN) John McFarland, 2, in Kenneth Essex Edgeworth—Victorian polymath and founder of the Kuiper belt?, Vistas in Astronomy, vol. 40, gennaio 1996, pp. 343–354, ISSN 0083-6656 (WC · ACNP).
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(EN) John McFarland, 2, in Kenneth Essex Edgeworth—Victorian polymath and founder of the Kuiper belt?, Vistas in Astronomy, vol. 40, gennaio 1996, pp. 343–354, ISSN 0083-6656 (WC · ACNP).