ハンス・フロイデンタール
1007/BF01274102 .
Strambach, Karl; Veldkamp, Ferdinand D. (1991), “In memoriam Hans Freudenthal”, Geometriae Dedicata 37 (2): 119, doi:10.1007/BF00147407 .
Gravemeijer, K.; Terwel, J. (2000), “Hans Freudenthal: A mathematician on didactics and curriculum theory”, Journal of Curriculum Studies 32 (6): 777–796, doi:10.1080/00220270050167170 .