https://www.nationalgeographic.com/history/article/ea-nasir-copper-merchant-ur
https://aventurasnahistoria.com.br/noticias/desventuras/cliente-irritado-ha-4-mil-anos-veja-curiosidades-sobre-reclamacao-mais-antiga.phtml
https://www.guinnessworldrecords.com/world-records/537889-oldest-written-customer-complaint
https://www.forbes.com/sites/kristinakillgrove/2018/05/11/meet-the-worst-businessman-of-the-18th-century/
https://www.forbes.com/sites/shephyken/2015/04/23/oldest-customer-service-complaint-discovered-a-lesson-from-ancient-babylon/#233dd9b75a06
https://www.ancient-origins.net/artifacts-ancient-writings/4000-year-old-ancient-babylonian-tablet-oldest-complaint-020313
https://pt.wikipedia.org/wiki/Placa_de_reclama%C3%A7%C3%A3o_a_Ea-nasir