- Smeltzer SC, Bare BG, Hinkle JL, Cheever KH. Text book of Medical Surgical Nursing. 12nd ed. Wolters Kluwer Health. Philadelphia Publishers.2010, 1, P: 1022-1026.
- Geti A. Emergency Nursing.1nd. Tehran, Boshra Publishers.1384, P: 53.(Persian)
- Sadatian A.Toxicity.7.Tehran:Samat;1379.(Persian)
- Haghyghat F, Zamani A. The Use of Nasogastric Tube in Abdominal Surgery. Journal of Medical Council of Islamic Republic of Iran.1379; 18(4):267-269.
- Aghabekloei A, Mostafazadeh B. Diagnosis and Treatment of Pharmaceutical and Chemical Acute Poisoning are Common in the Iran.1. Tehran:Hayan;1389.(Persian)
- Tsai Y- F, Luo C- F, Illias A, Lin C- C، Yu H- P. Nasogastric Tube Insertionin Anesthetized and Intubated Patients: a New and Reliable Method. BMC Gastroenterology.2012; 12:99.
- D-H, Kim N-Y, shin Y-S, Kim S-H. A Randomized Clinical Trial of Frozen Versus Standard Nasogastric Tube Placement. World journal of surgery. 2009; 33:1789-1792.
- Jethesh A, Prerana P. Nasogastric Tube Insertion Using Different Techniques in Anesthetized Patients: A Prospective, Randomized Study. AnesthAnalg 2009: 109:832-5.
- Upile T, Stimpson P, Christe M, Mahil J, Tailor H, Jerijes w. Use of Gel Caps to Aid Endoscopic Insertion of Nasogastric Feeding Tubes: A Comparative Audit. Head and neck oncology. 2011; 3:24.
10. Ghaemi M, Bagheri H. Cmparison of Success Rate of Three Methods of Nasogastric Intubation.komesh. 1390;12(4):402-6.(Persian)
11. Khan H, Khan I, Gupta A, Hussain N, Nageshwaran S. OSCEs for Medical Finals.1en ed. UK: Black well;2013.
12. Duri R, Venkatraman R. Nasogastric Tube Insertion Technique and Confirming Position. Nursing times. April 2009; 105:16.
13. Penrod J, Morse J, Wilson sh. Comforting Strategies uUsed During Nasogastric Tube Insertion.journal of clinical nursing.1999; 8:31-8.
14. Rojhani sherazi. Effect of Cold and Pain Thresholds in Women 18 to 25 Years. Journal of Babol University of Medical Sciences.1380;3(3):26-9.(Persian)
15. Craven F, Hirnle J. Fundamental of Nursing. 4nd Ed. New York: Lippincott Williams and Wilkins; 2003.
16. Taylor C. Clinical Nursing Skills. 3nd ed. China: Lippincott Williams and Wilkins; 2011.
17. Potter PA, Perry AG. Fundamental of Nursing. 7nd ed. Canada (NY): Mosby Elsevier; 2009.
18. Department of emergency medicine university of Ottawa. Nasogastric Tube Insertion (hompage on the internet). C 2013. Available from: http://www.med.ottawa.ca/procedure/ng/.
19. Harold C, Jane E. Factors Affecting Nasogastric Tube Insertion: Critical Care Medicine. 1984: Vol12:52-3.