por Gesell, Arnold, 1880-1961 [autor] | Pasamanick, Benjamin [editor] | Serebrinsky, Bernardo [traductor] | Amatruda, Catherine Strunk, 1903- [autor] | Knobloch, Hilda [editor].
por Gesell, Arnold, 1880-1961 [autor] | Amatruda, Catherine Strunk, 1903- [autor] | Serebrinsky, Bernardo [traductor].