Hi Anna, a good place to start with regard to the DRABCDE algorithm is to look at the history of trauma management and the development of the initial ABC approach, which was subsequently further developed and refined. An article which might be of assistance is:

Thim, T., Krarup,N., Grove, E., et al (2012). Initial assessment and treatment with the Airway, Breathing, Circulation, Disability, Exposure (ABCDE) approach. Int J Gen Med. 2012; 5: 117–121.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3273374/#!po=15.0000

Thank you so much Sandra- you've been very helpful!