APA (7th ed.) Citation

Koster, J. (2018). Hermann Ehrhardt: The man Hitler wasn't. Idle Winter Press.

Chicago Style (17th ed.) Citation

Koster, John. Hermann Ehrhardt: The Man Hitler Wasn't. Portland, Oregon: Idle Winter Press, 2018.

MLA (9th ed.) Citation

Koster, John. Hermann Ehrhardt: The Man Hitler Wasn't. Idle Winter Press, 2018.

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