HANLEY, P. Agriculture: A Fundamental Principle. The Journal of Bahá’í Studies, Ottawa, Ontario, Canada, v. 3, n. 1, 1990. DOI: 10.31581/jbs-3.1.1(1990). Disponível em: https://journal.bahaistudies.ca/online/article/view/44. Acesso em: 30 jul. 2021.