توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class E-F History : America. Gale Research.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class E-F History : America. Detroit: Gale Research, 1990.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class E-F History : America. Gale Research, 1990.