Santos, Victor D. O. “Rosetta Stone Portuguese (Brazil) Levels 1, 2, & 3 Personal Edition Version 4 (TOTALe)”. CALICO Journal 29, no. 1 (January 14, 2013): 173–176. Accessed July 16, 2024. https://journal.equinoxpub.com/Calico/article/view/17087.