Cita APA (7a ed.)

Freksa, F., & Preetorius, E. (1912). Phosphor. Georg Müller.

Cita Chicago Style (17a ed.)

Freksa, Friedrich, y Emil Preetorius. Phosphor. München: Georg Müller, 1912.

Cita MLA (8a ed.)

Freksa, Friedrich, y Emil Preetorius. Phosphor. Georg Müller, 1912.