APA (7th ed.) Citation

Sontag, R. J. (1971). A broken world, 1919-1939 / by R.J. Sontag. Harper and Row.

Chicago Style (17th ed.) Citation

Sontag, Raymond James. A Broken World, 1919-1939 / by R.J. Sontag. Harper and Row, 1971.

MLA (9th ed.) Citation

Sontag, Raymond James. A Broken World, 1919-1939 / by R.J. Sontag. Harper and Row, 1971.

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