Need help! (how to add sub section on wp blog)

I want to add more details to my articles. Specially trying to add two sections on my posts.

Two sections are:
1. References: like wiki does. (the bottom section called References
demo like: https://bounceapp.com/81440
2. Additional info like CRUNCHBASE profile on TechCrunch posts.
demo link: https://techcrunch.com/2012/11/21/att-reportedly-extending-facetime-over-cellular-to-some-users-on-grandfathered-unlimited-data-plans/

Are there any plugins available?
Thanks ??