Cita APA (7a ed.)

Putnins, R. (1935). On the division of earth's surface into zones of illumination. F. Vituma.

Cita Chicago Style (17a ed.)

Putnins, R. On the Division of Earth's Surface into Zones of Illumination. Riga: F. Vituma, 1935.

Cita MLA (8a ed.)

Putnins, R. On the Division of Earth's Surface into Zones of Illumination. F. Vituma, 1935.