Text ( visual ) : unmediated Principles of grammar & learning / William O'Grady. -- Chicago : University of Chicago Press , 1987. -- xiii, 233 p. : ill. ; 24 cm. -- Bibliography: p. 219-227 ; Includes index. -- ISBN 0226620743 ; (BA00609742) ; https://ci.nii.ac.jp/ncid/BA00609742 Other Title(s): Principles of grammar and learning. -- Author Heading(s): O'Grady, William. -- Classification(s): LCC : P151 ; DC19 : 415 ; NDC7 : 801.5. -- Subject Heading(s): LCSH : Grammar, Comparative and general ; LCSH : Language acquisition