APA (7th ed.) Citation

(1969). The political systems of empires. The Free Press [etc.].

Chicago Style (17th ed.) Citation

The Political Systems of Empires. The Free Press [etc.], 1969.

MLA (8th ed.) Citation

The Political Systems of Empires. The Free Press [etc.], 1969.

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