Teixeira-Santos, Ana Carolina, Tarek Nafee, Adriana Sampaio, Jorge Leite, and Sandra Carvalho. “Effects of Transcranial Direct Current Stimulation on Working Memory in Healthy Older Adults: A Systematic Review”. Principles and Practice of Clinical Research 1, no. 3 (December 4, 2015). Accessed December 1, 2022. https://journal.ppcr.org/index.php/ppcrjournal/article/view/25.