Source: https://www.researchgate.net/publication/321970263_so_much_immortal_wealth_Life_in_the_Sick-Room_by_Harriet_Martineau_as_Eco-Sustainable_Narrative/fulltext/5a3bade60f7e9ba14e42d243/so-much-immortal-wealth-Life-in-the-Sick-Room-by-Harriet-Martineau-as-Eco-Sustainable-Narrative.pdf