APA (7th ed.) Citation

(1989). Internationale Patentklassifikation. Heymann.

Chicago Style (17th ed.) Citation

Internationale Patentklassifikation. München: Heymann, 1989.

MLA (9th ed.) Citation

Internationale Patentklassifikation. Heymann, 1989.

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