1. Amalia, U. F. (2020). Pengaruh Permainan Kartu Domino Dengan Metode Gaple Terhadap Peningkatan Fungsi Kognitif Dan Motorik Halus Lansia Di Griya Werda Surabaya Penelitian Quasy Experiment [Undergraduate Thesis, Universitas Airlangga].
2. Amarya, S., Singh, K., Sabharwal, M., Amarya, S., Singh, K., & Sabharwal, M. (2018). Ageing Process and Physiological Changes. In Gerontology. IntechOpen. https://doi.org/10.5772/intechopen.76249
3. Badan Pusat Statistik. (2020). Statistik Penduduk Lanjut Usia 2020.
4. Castro, A., Signini, É. F., De Oliveira, J. M., Di Medeiros Leal, M. C. B., Rehder-Santos, P., Millan-Mattos, J. C., Minatel, V., Pantoni, C. B. F., Oliveira, R. V., Catai, A. M., & Ferreira, A. G. (2022). The Aging Process: A Metabolomics Perspective. Molecules, 27(24), Article 24. https://doi.org/10.3390/molecules27248656
5. Daeli, N. E., Pranata, L., Ajul, K., & Sukistini, A. S. (2022). Pendampingan lansia dalam meningkatkan fungsi kognitif dengan bermain puzzle. JCES (Journal of Character Education Society), 5(2), 403–407. https://doi.org/10.31764/jces.v5i2.6028