↑„556 Phyllis (1905 PW)“. JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Посетено на 5 May 2016.
↑Marciniak, A.; и др. (October 2007), „Photometry and models of selected main belt asteroids. IV. 184 Dejopeja, 276 Adelheid, 556 Phyllis“, Astronomy and Astrophysics, 473 (2): 633–639, Bibcode:2007A&A...473..633M, doi:10.1051/0004-6361:20077694.