APA (7th ed.) Citation

(1789). Petrographische Carte des Harz-Gebirges. [Helwing].

Chicago Style (17th ed.) Citation

Petrographische Carte Des Harz-Gebirges. S.l. [Hannover]: [Helwing], 1789.

MLA (9th ed.) Citation

Petrographische Carte Des Harz-Gebirges. [Helwing], 1789.

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