Martin، Raymond L.؛ White، Allan H.؛ Willis، Anthony C. (1977). "Structural Studies in Metal–Purpurate Complexes. Part 1. Crystal Ctructures of Potassium Purpurate Trihydrate and Ammonium Purpurate Monohydrate (Murexide)". J. Chem. Soc., Dalton Trans. ع. 14: 1336–1342. DOI:10.1039/DT9770001336.
Lewis، Michael J. (2011). "The Measurement and Significance of Ionic Calcium in Milk - A review". International Journal of Dairy Technology. ج. 64: 1–13. DOI:10.1111/j.1471-0307.2010.00639.x.
