STUDY GUIDE TO ACCOMPANY NATION OF NATIONS VOLUME I:TO 1877 SECOND EDITION
JAMES WEST DAVIDSON WILLIAM E.GIENAPP1994 年出版256 页ISBN:0070156360
THE ANALYSTICAL ENGINE AN INTRODUCTION TO COMPUTER SCIENCE USING HYPERCARD 2.1 SECOND EDITION
RICK DECKER STUART HIRSHFIELD1994 年出版391 页ISBN:0534936962