APA (7th ed.) Citation

Steffens, J. H. (1749). Placidus . [s.n.].

Chicago Style (17th ed.) Citation

Steffens, Johann Heinrich. Placidus . Zelle: [s.n.], 1749.

MLA (9th ed.) Citation

Steffens, Johann Heinrich. Placidus . [s.n.], 1749.

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