^"Metal-Organics Catalog" physical property data were obtained from Gelest, Inc. of Morrisville, Pennsylvania (US). Retrieved from SciFinder. [2020-12-09].
^Thomas, Joseph L.; Brown, Karen T. Zirconocene dicarbonyl and hafnocene dicarbonyl, first carbonyl derivatives of zirconocene and hafnocene. Journal of Organometallic Chemistry, 1976. 11 (3): 297-301. ISSN: 0022-328X.