1. Weast, R. C. 1972.Handbook of Chemistry and Physics, Edited by: Weast, R. C. 176Ohio: CRC Press.
2. Weast, R. C. 1972.Handbook of Chemistry and Physics, Edited by: Weast, R. C. 31Ohio: CRC Press.
3. Stecher, P. G. 1968.The Merck Index, Edited by: Stecher, P. G. 545New Jersey: Merck & Co. Ltd. Inc.