^Krzeminski, W. and Serkowski, K. (August, 1977). “Extremely high circular polarization of AN Ursae Majoris”. The Astrophysical Journal Letters216: L45. Bibcode: 1977ApJ...216L..45K. doi:10.1086/182506.
Coel Hellier (2001). Cataclysmic Variable Stars: How and Why They Vary. Springer Praxis. ISBN1-85233-211-5