“Professional Zakat in Modern Society Life: Provisions Regarding Intellectual Property Objects, Nisab, and Zakat Level”. Asy-Syir’ah: Jurnal Ilmu Syari’ah Dan Hukum, vol. 55, no. 2, Dec. 2021, pp. 439-63, https://doi.org/10.14421/ajish.v55i2.733.