1. Kirk, R. E., Othmer, D. F. (eds.): Encyclopedia of chemical technology. 2nd edit., Vol. 13. New York: John Wiley and Sons, Inc. 1967, pp. 645–659
2. Killeffer, D. H., Linz, A.: Molybdenum compounds. New York: Interscience Publishers, 1952, Chapters 2, 4, and 5
3. Tsigdinos, G. A.: Heteropoly compounds of molybdenum and tungsten. Climax Molybdenum Company Bulletin Cdb-12 (Revised), November 1969; see also Refs. 226) and 227)
4. Tsigdinos, G. A., Hallada, C. J.: Isopoly compounds of molybdenum, tungsten, and vanadium. Climax Molybdenum Company Bulletin Cdb-14, February 1969; see also Ref.228)
5. Properties of the simple molybdates. Climax Molybdenum Company Bulletin Cdb-4, October 1962