APA (7th ed.) Citation

Erkelenz, A. (1931). Duncker, Franz ([Electronic ed.].).

Chicago Style (17th ed.) Citation

Erkelenz, Anton. Duncker, Franz. [Electronic ed.]. 1931.

MLA (9th ed.) Citation

Erkelenz, Anton. Duncker, Franz. [Electronic ed.]. 1931.

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