(en) Svein Loeng, « Alexander Kapp--The First Known User of the Andragogy Concept », International Journal of Lifelong Education, vol. 36, no 6, , p. 629–643 (ISSN0260-1370, DOI10.1080/02601370.2017.1363826, lire en ligne, consulté le )
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(en) Svein Loeng, « Alexander Kapp--The First Known User of the Andragogy Concept », International Journal of Lifelong Education, vol. 36, no 6, , p. 629–643 (ISSN0260-1370, DOI10.1080/02601370.2017.1363826, lire en ligne, consulté le )
(en) Svein Loeng, « Alexander Kapp--The First Known User of the Andragogy Concept », International Journal of Lifelong Education, vol. 36, no 6, , p. 629–643 (ISSN0260-1370, DOI10.1080/02601370.2017.1363826, lire en ligne, consulté le )