1. California Hospital Association Hospital emergency code standardization survey 2011 http://www.hasc.org/sites/main/files/file-attachments/2011emercodesurveyresults11-30-11_final.pdf
2. Florida Hospital Association Overhead emergency codes 2014 hospital guidelines 2014 https://www.jointcommission.org/assets/1/6/EM-2014_RECOMMENDATIONS_FOR_HOSPITAL_EMERGENCY_CODES_FINAL_(2).pdf
3. Diversity of emergency codes in hospitals;Padilla-Elías;Int J Clin Med,2013
4. Colorado Hospital Association Colorado Hospital Association emergency code implementation guide https://cha.com/wp-content/uploads/2017/06/1-Emergency-Code-Implementation-Guide.pdf
5. Position statement: plain language emergency alerts;Winger;Emergency Nurses Association,2016