1. Ashtanga sangraham, Vagbhata, sutrasthana adhyaya Ch-1, First Edition
  2. Charak Samhita, Agnivesh, Brahmanand Tripathi , Sutrasthana Chapter 27, first edition
  3. Alastair Innes, Davidson's Essentials of Medicine, 2nd edition
  4. Agras WS, Berkowitz RI, Arnow BA, Telch CF, Marnell M, Henderson J, et al. Maintenance following a very low calorie diet, Journal of Consulting and Clinical Psychology.