Text ( visual ) : unmediated Data collection and analysis / edited by Roger Sapsford and Victor Jupp. -- : pbk. -- London : SAGE , 1996. -- xxi, 360 p. : ill. ; 25 cm. -- Bibliography: p. [343]-352 ; Includes index. -- ISBN 0761950451 ; 076195046X ; (BA29357539) ; https://ci.nii.ac.jp/ncid/BA29357539 Author Heading(s): Sapsford, Roger ; Jupp, Victor. -- Classification(s): DC20 : 001.42. -- Subject Heading(s): LCSH : Research -- Methodology ; LCSH : Statistics