Guiry, M.D. & Guiry, G.M. (2025). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry).
Cosmarium quadratum Ralfs ex Ralfs, 1848. Accessed through: RAS (Eds.) (2025) Register of Antarctic Species at: https://ras.biodiversity.aq/aphia.php?p=taxdetails&id=611125 on 2025-07-01
RAS (Eds.) (2025). Register of Antarctic Species.
Cosmarium quadratum Ralfs ex Ralfs, 1848. Accessed at: https://ras.biodiversity.aq/aphia.php?p=taxdetails&id=611125 on 2025-07-01