APA (7th ed.) Citation

Helfferich, F. Ionenaustauscher. Verlag Chemie.

Chicago Style (17th ed.) Citation

Helfferich, Friedrich. Ionenaustauscher. Weinheim/Bergstr: Verlag Chemie.

MLA (9th ed.) Citation

Helfferich, Friedrich. Ionenaustauscher. Verlag Chemie.

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