You must always make it absolutely clear if you are re-presenting material from another source. The simplest and clearest way to identify a quotation is with quote marks “…”

for example 
“the other pre-eminent name in British Computing, Maurice Wilkes, arguably contributed rather more than Turing, certainly in practical terms, but is much less prominent in the popular perception” [1]

The reference section at the end of the document must provide details of the source of the cited information as follows:

References

[1] Halley, M., Electronic Brains: Stories from the Dawn of the Computer Age. Washington DC: Joseph Henry Press, 2005.

How and When to Paraphrase – long quotes

Sometimes using direct quotations can be clumsy or problematic. Copyright law only allows you to copy small amounts of text (one or two lines). Longer quotes require the author to give permission. In such cases you should paraphrase the source by rewriting the material in your own words. For example the quote above could be re-written as

• Wilkes, though not as famous as Turing, perhaps made greater practical contribution [1]

How and When to Paraphrase – many quotes

You can paraphrase to make sure your report flows smoothly and reads well, a sequence of quotations may confuse your reader. But the paraphrase must be in your own words.
It is not acceptable to present a patchwork of short direct quotes which are not in quote marks.

Paraphrasing vs Plagiarism – are plagiarising if you:

• take too much from one source,
• only replace some words with synonyms, or
• simply swap words or phrases round to make the sentence look different

Instead you should

• summarise the key points from your source/sources
• use your own words and phrases
• comment on and evaluate your source

The examples above have been taken from the University of Southampton Academic Skills Guide.

http://www.academic-skills.soton.ac.uk/integrity/

The next section contains worked examples of quoting and paraphrasing which show in detail ways you can use source texts without breaching academic integrity