APA (7th ed.) Citation

Roehr, E. (1891). Methodologisch-mathematische Aphorismen.

Chicago Style (17th ed.) Citation

Roehr, Emil. Methodologisch-mathematische Aphorismen. Oppeln, 1891.

MLA (9th ed.) Citation

Roehr, Emil. Methodologisch-mathematische Aphorismen. 1891.

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