For every source you have mentioned in your paper, there should be a corresponding entry in your Reference list, except for the case when citing personal communication. The sources mentioned in your paper is known as in-text referencing or in-text citation. The in-text referencing could like one of the following:
The first format (1) is used when you wish to emphasize the author's work relevance to the point you are making.
Smith and Wexwood (2010) reported an increase in the number of books read, whereas Gibson (2011) reported a decrease. Albright, Wayne, and Fortinbras (2004) found no significant results.
J. D. Smith (2001) and D. E. Smith (2003) have also found … [Use initials for authors with same family name even if years of publication are different.]
Research by Jones (1995a) illustrated that...
When citing a patent, the in-text citation should shows the patent number follow by the year of issue (not the application (filed) year).
See the parts highlighted in yellow
Science is not just driven by practical needs and desires, but also by psychological need and desires. If we are to understand the evolution of physics we cannot just look at the history of its theories, we must also look at the psychology of its practitioners. We must go beyond intellectual history and also explore the emotional forces impacting on the community of physicists. (p. 12)