SPAJIĆ, Drago; ŠAPINA, Krešimir. AMQM System for Measuring the Quality of Postal Services. Promet - Traffic&Transportation, [S. l.], v. 19, n. 2, p. 129–137, 2007. Disponível em: https://traffic2.fpz.hr/index.php/PROMTT/article/view/2217. Acesso em: 27 aug. 2025.