por Polak, Frederik Lodewijk [autor] | Boulding, Elise.
por Kahn, Robert Louis, 1918 [autor] | Boulding, Elise [editor] | Foundation for Research on Human Behavior.
por Smith, Jackie G, 1968- [editor] | Chatfield, Charles, 1934- [editor] | Pagnucco, Ron [editor] | Boulding, Elise [prologuista] | Syracuse University.