Lua APA (7ú heag.)
Steffen, M. (1983). A model atmosphere analysis of the F5 IV-V subgiant Procyon. Univ., Math.-Naturwiss. Fak.
Lua i Stíl Chicago (17ú heag.)
Steffen, Matthias. A Model Atmosphere Analysis of the F5 IV-V Subgiant Procyon. Kiel: Univ., Math.-Naturwiss. Fak, 1983.
Lua MLA (9ú heag.)
Steffen, Matthias. A Model Atmosphere Analysis of the F5 IV-V Subgiant Procyon. Univ., Math.-Naturwiss. Fak, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.