APA (7th ed.) Citation

HPP Hentrich-Petschnigg & Partner (Düsseldorf). (1969). HPP-Informationen. HPP.

Chicago Style (17th ed.) Citation

HPP Hentrich-Petschnigg & Partner (Düsseldorf). HPP-Informationen. Düsseldorf: HPP, 1969.

MLA (9th ed.) Citation

HPP Hentrich-Petschnigg & Partner (Düsseldorf). HPP-Informationen. HPP, 1969.

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