:salam:
If you are writing a research paper, or anything for your college submission, you can ask your instructors about the type of referencing system they want you to use. Broadly speaking, there are two types of referencing systems: Harvard system which also known as the alphabetical system and the Numeric system.
ٍSister Noraina has shown you an example of the Numeric system, and the one that you have used in your OP is the Harvard system. You can find a brief guide on this page:
https://www.nottingham.ac.uk/studyin...ng/styles.aspx
In Microsoft Word, there is an easy option to properly cite your sources. Whenever you write a sentence or a paragraph that you want to cite from somewhere, click on the References tab and select Insert Citation. And then click on Add New Source and enter all the details. You will find the option to select the Style on the same tab, beside the Insert Citation button. Most engineering colleges use the IEEE style, which is a form of numeric style of citation and references.
After completing your research paper in Word, at the end of the document, click on the References tab once again and select Bibliography to insert the complete list of references.