look up writing styles and citing references. There are some websites that will even do that for free. If you are citing a source, you put a mark in the article where the sourced material is cited and then place a link at the bottom of your article. There are also some other rules. If it is a direct quote be sure you put quotes around the other authors words as in Dr soandso from the Medical Association states "insert his exact words here" and ALSO put a link to the source at the bottom. Otherwise if you are rewriting fully in your own words, but including ideas from others, you just cite it at the bottom of your article. It's very important with direct quotes to cite in your article and at the bottom.