How to I create links in the text of a Github-Pages webpage to Reference number?

Question

I am constructing a webpage via Github-Pages with Jekyll theme by Github to show an article. It contains references numbers that I want to link to the number in the Reference section. How do I create the hyperlink? Here is the link to its index.html

For example, in the Introduction section, there is this line

....Disease 2019 (COVID-19) 1

I want to link 1 to this reference in the Reference Section.

1. Gorbalenya AE, Baker SC, Baric RS, de Groot RJ, Drosten C, Gulyaeva AA, et al. The species Severe acute respiratory syndromerelated coronavirus: classifying 2019-nCoV and naming it SARS-CoV-2. Nature Microbiology, 2020-03;5(4): 536–544. https://doi.org/10.1038/s41564-020-0695-z

How do I do this?

A quite similar question is this. But unlike it, I want to link it to the reference number that is an ordered bullet.