UNDERSTANDING AND USING ENGLISH GRAMMAR SECOND EDITION TEACHER'S GUIDE VOLUME A
1991 年出版96 页ISBN:0139439943
UNDERSTANDING THE POLITICAL WORLD:A COMPARATIVE INTRODUCTION TO POLITICAL SCIENCE FOURTH EDITION
1998 年出版496 页ISBN:0801318521
UNDERSTANDING DNA AND GENE CLONING:A GUIDE FOR THE CURIOUS FOURTH EDITION
KARL DRLICA1994 年出版369 页ISBN:0471434167