Good news! The library databases will provide premade citations for you that are pretty accurate -- but always double-check. Common issues to fix:
Kirsch, Helen, and Christian Welzel. “Democracy Misunderstood: Authoritarian Notions of Democracy around the Globe.” Social Forces, vol. 98, no. 1, Sept. 2019, pp. 59–92. Military & Government Collection, doi.org/10.1093/sf/soy114.
Smith, Richard A. “Interest Group Influence in the U. S. Congress.” Legislative Studies Quarterly, vol. 20, no. 1, 1995, pp. 89–139. JSTOR, www.jstor.org/stable/440151. Accessed 16 Feb. 2021.
Wallach, Philip A. “Self-Government in a Republic of 325 Million: Distracting Anachronism or Worthy Aspiration?” Perspectives on Political Science, vol. 48, no. 2, Apr. 2019, pp. 109–124. Academic Search Complete, doi.org/10.1080/10457097.2018.1514906.
This is a huge category! Statutes, policy, reports... the government puts out lots of paperwork. Follow the basic MLA format: author, title, publisher/source, date, url.
Murray, Seth, et al. Female Executives and the Motherhood Penalty. CES-21-03, US Census Bureau, Jan. 2021, www.census.gov/library/working-papers/2021/adrm/CES-WP-21-03.html.
United States, Congress, House. Improving Broadband Access for Veterans Act of 2016. Congress.gov, www.congress.gov/bill/114th-congress/house-bill/6394/text. 114th Congress, 2nd session, House Resolution 6394, passed 6 Dec. 2016.