Cita APA (7th ed.)
Wallenquist, Å. (1975). Dark Matter in open clusters. Univ.
Cita Chicago (17th ed.)
Wallenquist, Åke. Dark Matter in Open Clusters. Uppsala: Univ, 1975.
Cita MLA (9th ed.)
Wallenquist, Åke. Dark Matter in Open Clusters. Univ, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.