Khamida, K. et al. 2018. Senam Tai Chi dalam Menurunkan Kecemasan Lansia. Jurnal Ners dan Kebidanan (Journal of Ners and Midwifery). 5, 3 (Dec. 2018), 218–223. DOI:https://doi.org/10.26699/jnk.v5i3.ART.p218-223.