Saryati, Saryati, et al. “MODIFIKASI BETAIN FOSFAT (CH3)3N+CH2COO-.H3PO4 DENGAN D20”. Jurnal Sains Materi Indonesia, vol. 3, no. 3, June 2002, pp. 15-18, doi:10.17146/jsmi.2002.3.3.5074.