How to Avoid Plagiarism
Introduce Source Material
Introducing source material alerts readers that you are, for the moment, no longer speaking entirely in your own voice. Quotations, paraphrases and summaries all must be properly introduced.
It is especially important to introduce paraphrases and summaries because otherwise readers won't realize that we are no longer expressing our own ideas.
Here's an example of a properly introduced quotation:
Robert Harbison (1977) describes the English reverence for home "that has not changed much to American eyes in a hundred years" (p.25).
Properly Introduced Source Material