William Owen Cole، Piara Singh Sambhi (1995)۔ The Sikhs: Their Religious Beliefs and Practices۔ Sussex Academic Press۔ صفحہ: 135–136۔ ISBN978-1-898723-13-4[مردہ ربط], Quote: "Since the time of Guru Amar Das it has been customary for Sikhs to assemble before their Guru on three of the most important Hindu festival occasions - Vaisakhi, Divali and Maha Shivaratri".
William Owen Cole، Piara Singh Sambhi (1995)۔ The Sikhs: Their Religious Beliefs and Practices۔ Sussex Academic Press۔ صفحہ: 135–136۔ ISBN978-1-898723-13-4[مردہ ربط], Quote: "Since the time of Guru Amar Das it has been customary for Sikhs to assemble before their Guru on three of the most important Hindu festival occasions - Vaisakhi, Divali and Maha Shivaratri".