por Gesell, Arnold, 1880-1961 [autor] | Ares, Dalia [traductor] | Fabricant, Luis [traductor] | Bullis, Glenna E [colaborador] | Ames, Louise Bates [autor] | Ilg, Frances Lillian, 1902- [autor].
por May, Rollo [autor] | Ares, Dalia [traductor] | Wald, Miguel [traductor] | May, Rollo. Psychology and the human dilemma.