NFPA 901 Standard Classifications for Incident Reporting and Fire Protection Data, 2001 ed. https://www.nfpa.org/assets/files/AboutTheCodes/90 1/901-F2005-ROP.pdf (Std: Class for Incid Reporting and Fr Prot Data - Amer) {355 NFC}
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}