Stead LG, Wijdicks EF, Bhagra A, Kashyap R, Bellolio MF, Nash DL, Enduri S, Schears R, William B (2009). «Validation of a new coma scale, the FOUR score, in the emergency department.». Neurocritical Care10 (1): 50-54. PMID18807215. doi:10.1007/s12028-008-9145-0.
Stead LG, Wijdicks EF, Bhagra A, Kashyap R, Bellolio MF, Nash DL, Enduri S, Schears R, William B (2009). «Validation of a new coma scale, the FOUR score, in the emergency department.». Neurocritical Care10 (1): 50-54. PMID18807215. doi:10.1007/s12028-008-9145-0.