In Cataloging Service Bulletin No. 38 Fall 1987, pp. 210, the Library of Congress announced that headings for computer programs and software should be treated as uniform titles. In subjects, therefore, they would be assigned the tag 630, with a second indicator of zero. Computer programming languages and computer systems including specific model names continue to be established as 650s, with a second indicator of zero.
OCLC Micro – Emerald Publishing
Published: Feb 1, 1988