David Rakoff (2005). “Don't Get Too Comfortable: The Indignities of Coach Class, The Torments of Low Thread Count, The Never- Ending Quest for Artisanal Olive Oil, and Other First World Problems”, p.222, Anchor
Jean de La Bruyère, Luc de Clapiers marquis de Vauvenargues (1903). “La Bruyère and Vauvenargues: Selections from the Characters, Reflexions and Maxims”