Text ( visual ) : unmediated Stuttering in children and adults : thirty years of research at the University of Iowa / edited by Wendell Johnson ; assisted by Ralph R. Leutenegger. -- Minneapolis : University of Minnesota Press , c1955. -- xviii, 472 p. : ill. ; 23 cm. -- (BA37597800) ; https://ci.nii.ac.jp/ncid/BA37597800 Author Heading(s): Johnson, Wendell ; Leutenegger, Ralph R.