(原始内容存档于2006-12-05). Detection of rings around Uranus, R. L. Millis, L. H. Wasserman, and P. V. Birch, Nature 267 (May 26, 1977), pp. 330–331. Abstract at
ISBN 978-1-938168-13-0. (原始内容存档于2020-11-01). Urry, Lisa A.; Cain, Michael L.; Wasserman, Steven A.; Minorsky, Peter V.; Reece, Jane B. Campbell Biology Eleventh