APA (7th ed.) Citation

Helmreich, E. C. (1965). History at a glance: Chronological chart of European civilization. Barron's Educational Series.

Chicago Style (17th ed.) Citation

Helmreich, Ernst Christian. History at a Glance: Chronological Chart of European Civilization. Woodbury, N.Y.: Barron's Educational Series, 1965.

MLA (9th ed.) Citation

Helmreich, Ernst Christian. History at a Glance: Chronological Chart of European Civilization. Barron's Educational Series, 1965.