Text ( visual ) : unmediated Programming perl / Larry Wall and Randal L. Schwartz. -- August 1991: Minor corrections. -- Sebastopol, Calif. : O'Reilly & Associates , c1990, 1991. -- xxi, 465 p. : 23 cm. -- (A nutshell handbook). -- Includes index ; "UNIX programming"--on cover. -- ISBN 0937175641 ; (BA13770194) ; https://ci.nii.ac.jp/ncid/BA13770194 Author Heading(s): Wall, Larry ; Schwartz, Randal L.