1. Phlebotomy Essentials;McCall,1998
2. Is skin puncture beneficial prior to arterial catheter insertion?;Bhardwaj;Can J Anaesth,1999
3. Office and Bedside Procedures;Chestnutt,1996
4. Arterial puncture;Fowler,2003
5. Pain during arterial puncture;Giner;Chest,1996