APA (7th ed.) Citation

Hordyński, J., & Karl, J. (1969). Perpetuum mobile. Emil Pilgram Verlag.

Chicago Style (17th ed.) Citation

Hordyński, Jerzy, and Jo Karl. Perpetuum Mobile. Hoffnungsthal: Emil Pilgram Verlag, 1969.

MLA (9th ed.) Citation

Hordyński, Jerzy, and Jo Karl. Perpetuum Mobile. Emil Pilgram Verlag, 1969.