Copyright
An author, when quoting from someone else's work or when considering reproducing an illustration or table from a book or journal article, should make sure that he is not infringing a copyright.
Although in general an author may quote from other published works, one should obtain permission from the holder of the copyright if he or she wishes to make substantial extracts or to reproduce tables, plates, or other illustrations. If the copyright-holder is not the author of the quoted or reproduced material, it is recommended that the permission of the author should also be sought.
Material in unpublished letters and manuscripts is also protected and must not be published unless permission has been obtained.
A suitable acknowledgment of any borrowed material must always be made.
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