^Bukovec, Natasa; Bukovec, Pteter; Siftar, Joze. Salts and double salts of rare earths. I. Thermal analysis of hydrated sulfates. Vestnik Slovenskega Kemijskega Drustva, 1975. 22 (1-4): 5-17. ISSN: 0560-3110.
^Mathias S. Wickleder. Syntheses, crystal structures, and thermal behavior of Er2(SO4)3·8H2O and Er2(SO4)3·4H2O. Zeitschrift fuer Anorganische und Allgemeine Chemie, 1999. 625 (9): 1548-1555. ISSN: 0044-2313.
