  :Hi. I just wanted to update you on this. It's okay to copy public domain sources, such as those created by the US government or employees of the government in scope of their jobs, but to comply with Wikipedia:Plagiarism, you do need to acknowledge when you are copying or closely following them. This is good practice even beyond plagiarism concerns in that it can help people see that content is not a copyright problem. I've provided attribution for this article; you can generally find templates to help you with this at Category:Attribution templates. Thanks.   