توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Library of Congress. Office for Subject Cataloging Policy. (1990). Classification. Class D. Subclasses DL-DR. History of Europe, part 2 (3rd ed.). Library of Congress For sale by the Cataloging Distribution Service, Library of Congress.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Library of Congress. Office for Subject Cataloging Policy. Classification. Class D. Subclasses DL-DR. History of Europe, Part 2. 3rd ed. Washington: Library of Congress For sale by the Cataloging Distribution Service, Library of Congress, 1990.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Library of Congress. Office for Subject Cataloging Policy. Classification. Class D. Subclasses DL-DR. History of Europe, Part 2. 3rd ed. Library of Congress For sale by the Cataloging Distribution Service, Library of Congress, 1990.