Text ( visual ) : unmediated Language in use : pre-intermediate / Adrian Doff, Christopher Jones. -- Split ed.. -- Classroom book ; A ; Classroom book ; B. -- Cambridge : Cambridge University Press , 1991. -- v. : ill. (some col.) ; 30 cm. -- ISBN 0521408350 ; 0521408369 ; (BA46242781) ; https://ci.nii.ac.jp/ncid/BA46242781 Author Heading(s): Doff, Adrian ; Jones, Christopher