To avoid plagiarizing:
Paraphrase: put the ideas from the text COMPLETELY into your own words. Even when paraphrasing you must still use in-text citations as well as including it in the works cited section.
Use quotation marks around text that has been taken directly from the original source.
Cite every source of information you use in your paper unless it is common knowledge (i.e. the sky is blue) or the results of your own research.
You must cite a source that you are using if you paraphrase or summarize any of the ideas given in the work AND if you use a direct quote from the resource (word-for-word). Citations are not just for word-for-word quotations; they must be used when you mention any ideas or information from a source.