I guerrieri delle galassie by Murray Leinster and Poul Anderson and E.E. "Doc" Smith and Larry Niven and Edmond Hamilton and Harry Harrison and Leigh Brackett and Joe Haldeman and Eric Frank Russell and Orson Scott Card and Philip K. Dick and Robert Silverberg and Richard McKenna and Jack Vance and Fred Saberhagen and Gordon R. Dickson and Keith Laumer and Lester del Rey