Айзек Азимов: Foundation Series/Foundation Bk 1/Foundation and Empire Bk 2/Second Foundation Bk 3/Foundations Edge Bk 4 (Paperback, 1986, Ballantine Books)
Foundation Series/Foundation Bk 1/Foundation and Empire Bk 2/Second Foundation Bk 3/Foundations Edge Bk 4 by Айзек Азимов
Novels: Foundation Foundation and Empire Second Foundation Foundation's Edge