On the topic of the professional responsibility, I've been asked to address three closely related topics having to do with being a researcher and author:
respecting the intellectual property of others,
using citation management tools such as EndNote and Zotero. These tools help in organizing writing projects and in avoiding intellectual property errors. (Plus, they are a big help in formatting written work.)
Good basics to remember:
Credit others for their work (and cite your own earlier work, if appropriate).
Give credit in such a way that allows the cited work to be easily located.
At least some trouble can be avoided by getting organized, staying organized, and keeping careful records.