APA (7th ed.) Citation

Rigge, W. F. (1913). A Heliostat for the lecture room. s.n.

Chicago Style (17th ed.) Citation

Rigge, William F. A Heliostat for the Lecture Room. [S.l.: s.n, 1913.

MLA (9th ed.) Citation

Rigge, William F. A Heliostat for the Lecture Room. s.n, 1913.