Text ( visual ) : unmediated Language and communication / prepared for the course team by David Graddol. -- Milton Keynes : Open University Press , c1987. -- 56 p. ; 30 cm. -- (Communication and education ; block 1 . Language and communication ; unit 2-3). -- ISBN 0335133568 ; (BA11395414) ; https://ci.nii.ac.jp/ncid/BA11395414 Author Heading(s): Graddol, David

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