APA (7th ed.) Citation

Wagner, R. (1899). Briefe an Emil Heckel. [s.n.].

Chicago Style (17th ed.) Citation

Wagner, Richard. Briefe an Emil Heckel. Berlin: [s.n.], 1899.

MLA (9th ed.) Citation

Wagner, Richard. Briefe an Emil Heckel. [s.n.], 1899.

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