I have an article with in-text citations and list of references. I have not used any of reference managers, just used word. Is there any way to automatically link in-text citation to individual references on the reference list?
Yes. It is quite easy to do, once you know how.
First, go to the References tab, then click on Insert Citation and Add New Source.
Next, fill out the information as appropriate.
When you want your References List produced, go to Bibliography.
This is extremely helpful when you need to change some detail (say publication date) and you have many citations to the same material. Change it in one place and Word will update all of the in-text citations as well as the references list.