*W G Melbourne, J D Mulholland, W L Sjogren, F M Sturms (1968), "Constants and Related Information for Astrodynamic Calculations", NASA Technical Report 32-1306, Jet Propulsion Laboratory, July 15, 1968.
* W G Melbourne, J D Mulholland, W L Sjogren, F M Sturms (1968), «Constants and Related Information for Astrodynamic Calculations», NASA Technical Report 32-1306, Jet Propulsion Laboratory, July 15, 1968.