A Comparative Study of Postal Mail Services and Courier Services with Special Reference to Kanniyakumari District. International Journal of Food and Nutritional Sciences, [S. l.], v. 11, n. 10, p. 1589–1593, 2022. Disponível em: https://www.ijfans.org/index.php/Journal/article/view/10811. Acesso em: 17 jul. 2026.