1. http://www.lww.co.uk/emergency-medicine-toxicology/decision-making-in-emergency-critical-care;2015
2. https://www.cambridge.org/core/books/emergency-airway-management/65F6E8117405BA92AD27281939DB1EB8
3. https://www.scribd.com/document/353543024/Roberts-Hedges-Clinical-Procedures-in-Emergency-Medicine-6th-Ed-PDF-Tahir99-VRG
4. http://accessemergencymedicine.mhmedical.com/book.aspx?bookID=683
5. http://bookstore.acep.org/emergency-department-resuscitation-of-the-critically-ill-1st-ed-560000