por Gettys, W. Edward [autor] | Keller, Frederick J, 1934- [autor] | Skove, Malcolm J, 1931- [autor] | Arizmendi López, Luis [traductor] | García Solé, José A [traductor] | Zaldo Luezas, Carlos E [traductor].
por Gettys, W. Edward [autor] | Keller, Frederick J, 1934- [autor] | Skove, Malcolm J, 1931- [autor] | Arizmendi Lopez, Luis [traductor] | Garcia Sole, Jose A [traductor].