RIZVI, S. T. H.; HUSSAIN, T. Secrets of Sufism in Iqbal’s Letter: Understanding and Analysis. sourcecoder, Gujranwala, Pakistan, v. 5, n. 1, p. 422–432, 2024. DOI: 10.47205/makhz.2024(5-I)urdu-31. Disponível em: https://ojs.sourcecoder.tk/journal/article/view/313. Acesso em: 6 dec. 2025.