Cita APA (7a ed.)

Ljunggren, B. (1966). The Uppsala spectral classification and the interstellar absorption in a region near the north galactic pole. [s.n.].

Cita Chicago Style (17a ed.)

Ljunggren, Bertil. The Uppsala Spectral Classification and the Interstellar Absorption in a Region Near the North Galactic Pole. Uppsala: [s.n.], 1966.

Cita MLA (9a ed.)

Ljunggren, Bertil. The Uppsala Spectral Classification and the Interstellar Absorption in a Region Near the North Galactic Pole. [s.n.], 1966.