APA (7th ed.) Citation

Gernsheim, H., & Gernsheim, A. (1960). Historic events 1839-1939 / by H. Gernsheim and A. Gernsheim. Longmans.

Chicago Style (17th ed.) Citation

Gernsheim, Helmut, and Alison Gernsheim. Historic Events 1839-1939 / by H. Gernsheim and A. Gernsheim. Longmans, 1960.

MLA (9th ed.) Citation

Gernsheim, Helmut, and Alison Gernsheim. Historic Events 1839-1939 / by H. Gernsheim and A. Gernsheim. Longmans, 1960.

Warning: These citations may not always be 100% accurate.