Cita APA (7th ed.)
Sinding, E. (1935). The original Orbit of comet 1904 I (Brooks). Levin & Munksgaard.
Cita Chicago (17th ed.)
Sinding, Erik. The Original Orbit of Comet 1904 I (Brooks). København: Levin & Munksgaard, 1935.
Cita MLA (9th ed.)
Sinding, Erik. The Original Orbit of Comet 1904 I (Brooks). Levin & Munksgaard, 1935.
Atenció: Aquestes cites poden no estar 100% correctes.