Text ( visual ) : unmediated Communicate clearly / Robert Heller. -- 1st American ed. -- New York : Dorling Kindersley Pub. , 1998. -- 72 p. : col. ill. ; 18 cm. -- (Essential managers). -- Includes index. -- ISBN 0789432447 ; (BA67604315) ; https://ci.nii.ac.jp/ncid/BA67604315 Author Heading(s): Heller, Robert