Strömgren, E. (1947). The short periodic comets and the hypothesis of their capture by the major planets. Munksgaard.
Chicago-Zitierstil (17. Ausg.)Strömgren, Elis. The Short Periodic Comets and the Hypothesis of Their Capture by the Major Planets. København: Munksgaard, 1947.
MLA-Zitierstil (9. Ausg.)Strömgren, Elis. The Short Periodic Comets and the Hypothesis of Their Capture by the Major Planets. Munksgaard, 1947.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.