APA (7th ed.) Citation

Heintz, K. (2014). Animated timeline of the major events of World War I. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Heintz, Kurt. Animated Timeline of the Major Events of World War I. Chicago, IL: Encyclopedia Britannica, 2014.

MLA (9th ed.) Citation

Heintz, Kurt. Animated Timeline of the Major Events of World War I. Encyclopedia Britannica, 2014.

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