Prakash, D., R. Chandra, B. Kumar, and Anuj K. Gupta. 2010. “Alkali Metal Complexes: Mixed Ligand Complexes of Alkali Metal Salts of 1-Hydroxy Anthraquinone With Oxygen Donor Ligands”. Asian Journal of Chemistry 13 (3):854-58. https://asianpubs.org/index.php/ajchem/article/view/22701.