Text ( visual ) : unmediated Communication and change / prepared for the course team by Liz Dawtrey. -- Milton Keynes : Open University Press , c1987. -- 34 p. : ill. ; 30 cm. -- (Communication and education ; block 9 . The social organization of communication ; unit 30). -- ISBN 0335133789 ; (BA11414596) ; https://ci.nii.ac.jp/ncid/BA11414596 Author Heading(s): Dawtrey, Liz

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