UNDERSTANDING AND PREVENTING ONLINE SEXUAL EXPLOITATION OF CHILDREN
ETHEL QUAYLE AND KURT M.RIBISL2012 年出版278 页ISBN：0415689403
IN CONFLICT AND ORDER UNDERSTANDING SOCIETY NINTH EDITION
D.STANLEY EITZEN MAXINE BACA ZINN2001 年出版587 页ISBN：0205306446
STUDY GUIDE FOR UNDERSTANDING SOCIAL PROBLEMS SECOND EDITION
LINDA MOONEY DAVID KNOX CAROLINE SCHACHT2000 年出版236 页ISBN：0534565123
UNDERSTANDING ANTITRUST AND ITS ECONOMIC IMPLICATIONS FIFTH EDITION
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UNDERSTANDING STATISTICS IN THE BEHAVIORAL SCIENCES 7TH EDITION
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PSYCHOLINGUISTIC APPROACHES TO MEANING AND UNDERSTANDING ACROSS LANGUAGES
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UNDERSTANDING SOLIDS THE SCIENCE OF MATERIALS 2ND EDITION
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