↑ Dawe, Donald G. "Srī Gurū Nānak Dev". Encyclopaedia of Sikhism. Patiala: Punjabi University Patiala. Archived from the original on 29 July 2017. สืบค้นเมื่อ 18 August 2015.
↑ Hayer, Tara (1988). Economic History of Sikhs: Sikh Impact. 1. Surrey, BC: Indo-Canadian Publishers. p. 14.
