APA (7th ed.) Citation

Hagen, K. H. (1844). System of political economy. Printed for Longman, Brown, Green and Longmans.

Chicago Style (17th ed.) Citation

Hagen, Karl Heinrich. System of Political Economy. London: Printed for Longman, Brown, Green and Longmans, 1844.

MLA (9th ed.) Citation

Hagen, Karl Heinrich. System of Political Economy. Printed for Longman, Brown, Green and Longmans, 1844.

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