1. Ames, W. (1642). The marrow of sacred divinity drawne out of the Holy Scriptures… [Medulla theologica. 1642]. Henry Overton.
2. Baxter, R. (1675). A treatise of self-Denial. Robert White. https://quod.lib.umich.edu/e/eebo/A27053.0001.001?view=toc
3. Bouckaert, L., Opdebeeck, H., & Zsolnai, L. (2011). Frugality. In Handbook of spirituality and business (pp. 269–276). Springer.
4. Braun, V., & Clarke, V. (2006). Using thematic analysis in psychology. Qualitative Research in Psychology, 3(2), 77–101.
5. Calder, L. (2012). Saving and spending. In F. Trentmann (Ed.), The Oxford handbook of the history of consumption. Oxford University Press.