W. S. Rahayu, P. I. Utami, and A. Kurniawati, “Validitas Penetapan Kadar Kalsium dalam Sediaan Tablet Multivitamin Secara Spektrofotometri Ultraviolet-Visibel”, Pharm. : j. farm. Indones., vol. 8, no. 02, pp. 34–41, Aug. 2011.