American National Standards Institute. (2012). NFPA 257: Standard on fire test for window and glass block assemblies (2012 edition.). National Fire Protection Association.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিAmerican National Standards Institute. NFPA 257: Standard on Fire Test for Window and Glass Block Assemblies. 2012 edition. Quincy, Massachusetts: National Fire Protection Association, 2012.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিAmerican National Standards Institute. NFPA 257: Standard on Fire Test for Window and Glass Block Assemblies. 2012 edition. National Fire Protection Association, 2012.
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