Text ( visual ) : unmediated Immigration as an economic asset : the German experience / edited by Sarah Spencer. -- Stoke-on-Trent : IPPR/Trentham Books , 1994. -- xxviii, 108 p. : ill. ; 23 cm. -- Includes bibliographical references. -- ISBN 1858560101 ; (BA71707297) ; https://ci.nii.ac.jp/ncid/BA71707297 Author Heading(s): Spencer, Sarah ; Institute for Public Policy Research (London, England). -- Classification(s): DC20 : 331.620943