por Heward, William L, 1949- [autor] | Espinosa Bayal, Maria Angeles [traductor] | Jockl, Alejandro (Jockl Rueda) [traductor].
por Sprinthall, Norman A, 1931- [autor] | Sprinthall, Richard C, 1930- [autor] | Oja, Sharon Nodie [autor] | Espinosa Bayal, Maria Angeles [traductor].