Pimsleur European Portuguese Official
Research on the effectiveness of the Pimsleur method for European Portuguese is limited. However, studies on the method's effectiveness for other languages suggest that it can be a valuable tool for language learners.
An Evaluation of the Pimsleur Method for Learning European Portuguese pimsleur european portuguese
Larsen-Freeman, D. (2007). An introduction to applied linguistics: From practice to theory. Hodder Education. Research on the effectiveness of the Pimsleur method