Callanan, Martin. "Cirrus floccus". International Cloud Atlas. nephology.eu. Archived from the original on 30 December 2020. Retrieved 13 July 2011.
sdsmt.edu
ias.sdsmt.edu
Institute of Atmospheric Sciences at the South Dakota School of Mines & Technology. "Cirrus (floccus)". A Guide to the Sky. Archived from the original on 10 February 2011. Retrieved 13 July 2011.
web.archive.org
Callanan, Martin. "Cirrus floccus". International Cloud Atlas. nephology.eu. Archived from the original on 30 December 2020. Retrieved 13 July 2011.
Institute of Atmospheric Sciences at the South Dakota School of Mines & Technology. "Cirrus (floccus)". A Guide to the Sky. Archived from the original on 10 February 2011. Retrieved 13 July 2011.