APA (7th ed.) Citation

Upward, A. Secret History of To-day: Being Revelations of a Diplomatic Spy.

Chicago Style (17th ed.) Citation

Upward, Allen. Secret History of To-day: Being Revelations of a Diplomatic Spy.

MLA (9th ed.) Citation

Upward, Allen. Secret History of To-day: Being Revelations of a Diplomatic Spy.

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