Mal:Kilde doi/10.1029.2FJA092iA13p14918

Plescia, J. B. (1987). «Cratering history of the Uranian satellites: Umbriel, Titania and Oberon». Journal of Geophysical Research. 92 (A13): 14918–14932. Bibcode:1987JGR....9214918P. doi:10.1029/JA092iA13p14918.