Other forms of plagiarism
Don't forget that plagiarism can occur not only in your use of text but also in accompanying illustrations, maps and tables. Make sure that in the captions to these you fully reference and acknowledge any material or ideas taken from a source that is not your own. Minor changes, rewording or redrawing may be enough to avoid infringing copyright, but not to avoid the charge of plagiarism. Remember that you also need to take steps to avoid plagiarism in an oral presentation by making appropriate acknowledgements to the authors you quote, either in your talk or in the OHPs that you use.