SHAOUT, A.; KHAN, S. ALHAJJ – HAJJ APP FOR IOS. IIUM Engineering Journal, [S. l.], v. 17, n. 1, p. 1–27, 2016. DOI: 10.31436/iiumej.v17i1.528. Disponível em: https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/528. Acesso em: 27 jan. 2022.