When citing sources for your paper you will use the citation style your professor assigns. In Portuguese Studies, that style is often the Modern Languages Association (MLA) style. This page provides links to the Citing Sources LibGuide and information on avoiding plagiarism.
I recommend looking at the Citing Sources LibGuide as it provides information for the most common citation styles used across the disciplines.
UMD Academic Regulations and Procedures - Read this passage from your student handbook!
Avoiding Plagiarism - OWL Guide from Purdue - This emphasizes when to give credit to sources and offers safe practices to follow.