Holland, T. J. B.; Powell, R. (1990). "An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: The system K₂–Na₂O–CaO–MgO–MnO–FeO–Fe₂O₃–Al₂O₃–TiO₂–SiO₂–C–H₂–O₂". Journal of Metamorphic Geology. 8: 89. doi:10.1111/j.1525-1314.1990.tb00458.x.