If you are writing a research paper for a particular course, the professor may require that a specific citation style be used for the assignment.
The American Psychological Association standard (APA-standard) is used in most social and psychological papers, and variations of the author/date style are used by many scientific disciplines.
For this style, after every paraphrase, you include the surname of the author and the date of writing.
You will need to create a bibliography or reference list of all of the sources that you use, but you will also need to indicate within the text where your information came from.
Referencing is an essential part of writing any research paper, so err on the side of caution.