All mercantile occupancies of more than 280 m2 (23000 ft2), but not more than 2800 m2 (30,000 ft2), aggregate gross area and occupying not more than three stories for sales purposes. NFPA 1, 2003 ed
National Fire Protection Association, Illustrated Dictionary of Fire Service Terms, Jones & Bartlett Publishers, MA. USA 2006. https://books.google.com.kw/books?id=W0WIRa3Gl4QC& printsec=frontcover&source=gbs_ge_summary_r&cad=0# v=onepage&q&f=false, (Fr Srvc - Amer) {141}