1. Bansal, Y. (2015, April 30). Influence of age on buyer behavior. Academike. https://www.lawctopus.com/academike/influence-of-age-on-buyer-behaviour/
2. Bhandari, P. (2023). What is quantitative research? | Definition, uses & methods. Scribbr. https://www.scribbr.com/methodology/quantitative-research/
3. Davis, J. (2020). Successful marketing strategies for small business sustainability. Walden University ScholarWorks. https://scholarworks.waldenu.edu/dissertations/?utm_campaign=PDFCoverPages&utm_medium=PDF&utm_source=scholarworks.waldenu.edu%2Fdissertations%2F6052&fbclid=IwAR33keo6sX_uWaXQMNv0JX1sDfrBVSAEEwQagoZaqd_0YfhUoOUQ4s4Bjbk
4. Donassolo, P. H. & de Matos, C.A. (2014, October 8). The Predictors of Sales Performance: A study with wholesale sellers. Review of Business Managementhttps://www.researchgate.net/publication/273061654_The_Predictors_of_Sales_Performance_a_study_with_wholesale_sellers
5. Firmansyah, F., Margono, S., Rohman, F., & Khusniyah, N. (2019, January 1). The Concept and Steps of Personal Selling. https://doi.org/10.2991/iconies-18.2019.43