sixth edition Understanding human sexuality
Janet Shibley Hyde and john D.delamater1997 年出版685 页ISBN：0070318026
Understanding the law sixth edition
Donald L.Carper and john A.mckinsey2012 年出版793 页ISBN：0538473592
UNDERSTANDING THE PRESIDENCY THIRD EDITION
EDITED BY JAMES P.PFIFFNER ROGER H.DAVIDSON2003 年出版471 页ISBN：
UNDERSTANDING LABOR LAW THIRD EDITION
DOUGLAS E.RAY CALVIN WILLIAM SHARPE ROBERT N.STRASSFELD2011 年出版398 页ISBN：1422470268
UNDERSTANDING AMERICAN GOVERNMENT EIGHTH EDITION
SUSAN WELCH JOHN GRUHL JOHN COMER SUSAN M.RIGDON著2222 年出版621 页ISBN：0534647499
understanding your health seventh edition
WAYNE A.PAYNE，Ed.D. DALE B.HAHN，Ph.D.2222 年出版772 页ISBN：0072353236
