Clifford J.C.J.CunninghamClifford J.C.J., Studies of Pallas in the Early Nineteenth Century, Cham: Springer International Publishing, 2017, s. 105, DOI: 10.1007/978-3-319-32848-5_5, ISBN 978-3-319-32846-1(ang.).
Brown, A. G. A: Gaia data release 2 (Gaia DR2). [w:] "Gaia Data Release 2. Summary of the contents and survey properties" [on-line]. 2018-4-25. [dostęp 2019-11-23]. (ang.).