1. Appenzeller, I. (1967). Polarimetric observations of spiral galaxies. Publications of the Astronomical Society of the Pacific, 79, 600–606.
2. Beck, R., & Wielebinski, R. (2021). Chapter 13: Magnetic fields in galaxies. In G. Gilmore (Ed.), Planets, stars, stellar systems. Springer.
3. Beck, R., Berkhuijsen, E. M., & Wielebinski, R. (1978). Detection of polarized radio emission in M31. Astronomy and Astrophysics, 68, L27–L29.
4. Beck, R., Berkhuijsen, E. M., & Wielebinski, R. (1980). Distribution of polarized emission in M31. Nature, 283, 272–275.
5. Beck, R., Kronberg, P. P., & Wielebinski, R. (1989). Galactic and intergalactic magnetic fields. Cluver Academic Publishers.