Citation Verified Memento
📖 https://www.census.gov/content/dam/Census/library/visualizations/time-series/demo/families-and-households/hh-4.pdf 2021.05.18
📖 https://ourworldindata.org/living-alone 2021.05.17
📖 https://www.self.inc/blog/adults-living-alone 2021.05.17