Zigel, F. (1968). Wonders of the night sky. Mir.
Cita Chicago (17th ed.)Zigel, F. Wonders of the Night Sky. Moscow: Mir, 1968.
Cita MLA (9th ed.)Zigel, F. Wonders of the Night Sky. Mir, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.
Zigel, F. (1968). Wonders of the night sky. Mir.
Cita Chicago (17th ed.)Zigel, F. Wonders of the Night Sky. Moscow: Mir, 1968.
Cita MLA (9th ed.)Zigel, F. Wonders of the Night Sky. Mir, 1968.