APA (7th ed.) Citation

Oppenheimer, F. System der Soziologie. G. Fischer (Jena).

Chicago Style (17th ed.) Citation

Oppenheimer, Franz. System Der Soziologie. G. Fischer (Jena).

MLA (8th ed.) Citation

Oppenheimer, Franz. System Der Soziologie. G. Fischer (Jena).

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