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by Hawking, Stephen W.; Hawking, Lucy; Padilla, Silvia Pons
by Hawking, Stephen W.; Pineda, Eloy
by Hawking, Stephen W.
by Hawking, Stephen
by Hawking, Stephen W.; Hawking, Lucy; De Dios, Laura Martin
by Edited by Stephen Hawking , W. Israel
by Hawking, Stephen W.; Penrose, Roger; Sanz, Javier Garcia
by Hawking, Stephen W.; Sagan, Carl
by Hawking, Stephen W.; Hawking, Lucy; Pradilla, Sílvia Pons
by Hawking, Stephen W.; Hawking, Lucy; Ibeas, Juan Manuel