Library of Congress. Subject Cataloging Division, Gale Research Company, & Savage, H. (1982). Library of Congress classification schedules, a cumulation of additions and changes through 1981, Class Z: Bibliography and library science. Gale Research Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Library of Congress. Subject Cataloging Division, Gale Research Company, و Helen Savage. Library of Congress Classification Schedules, a Cumulation of Additions and Changes Through 1981, Class Z: Bibliography and Library Science. Detroit, Mich.: Gale Research Co., 1982.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Library of Congress. Subject Cataloging Division, et al. Library of Congress Classification Schedules, a Cumulation of Additions and Changes Through 1981, Class Z: Bibliography and Library Science. Gale Research Co., 1982.