AristótelesAzorinBayer, OsvaldoCampbell, JosephChesterton, G. K.Copleston, FrederickFischer, TiborFromm, ErichGreene, GrahamGrimal, PierreHessen, JohannesHuxley, AldousIngenieros, JoseJaspers, KarlKenny, AnthonyKierkegaard, SorenKoestler, ArthurLefebvre, HenriMarinoff, LouMarqués de SadeMonod, JacquesMoro, TomásNietzsche, FriedrichOrtega y Gasset, JoséPapini, GiovanniPlatónSartre, Jean-PaulSavater, FernandoScruton, RogerTrese, Leo J.