International City/County Management Association. 2018 Municipal Form of Government Survey – Summary of Survey Results. Washington, DC: ICMA, 2019. http://icma.org. Massachusetts Municipal Association. (2019). Forms of Municipal Government - Massachusetts Municipal Directory. https://41g41s33vxdd2vc05w415s1e-wpengine.netdna-ssl.com/wp-content/uploads/2017/12/FormsofGov2019-2020MassMuniDirectory.pdf National League of Cities. Cities 101 — Forms of Municipal Government (2021). https://www.nlc.org/resource/cities-101-mayoral-powers/