1. htps://valmcbeath.com/victorian-era-middle-classes/#.YVMb2y1h200
2. https://sites.udel.edu/britlitwiki/social-and-family-life-in-the-late17th-early-18th-centuries/
3.https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199935338.001.0001/oxfordhb-9780199935338-e-007
4. https://www.bbc.co.uk/history/british/victorians/middle_classes_01.shtml
5. https://edurev.in/question/518550/Which-social-groups-emerged-in-the-18th-century-a-
6. https://www.jstor.org/stable/44613439
7. https://www.britannica.com/topic/Robinson-Crusoe-novel