References (Books):

1. Gorakhnath And The Kanphata Yogis -- George Weston Briggs
2. Philosophy Of Gorakhnath -- A.K.Banerjea
3. The Dabistan -- David Shea and Anthony Troyer
4. Hatha Yoga Pradipika -- Swami Muktibodhananda
5. Shidashidhantphadhati -- Swami Dwarakadas Shartri
6. Gorakshnath Nath Sampradya -- Dr. Narendranath Udadhaya
7. Creation Of Nath Sidhas – Hajariprasad Dewadi
8. Goraksh Bani – Dr. Pitambardatt Barthawal

References (Websites):

1. Http://www.rudraksham.com
2. Http://www.kheper.net/topics/tantra/natha_siddhas.htm
   
3. Http://www.omaadesh.org.np