Cite
MLA Citation
British Standards Institution,. Expert Commentary on BS EN 50849:2017. Sound systems for emergency purposes.. London : British Standards Institution, 2017. http://access.bl.uk/ark:/81055/vdc_100128464824.0x000001
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British Standards Institution,. Expert Commentary on BS EN 50849:2017. Sound systems for emergency purposes.. London : British Standards Institution, 2017. http://access.bl.uk/ark:/81055/vdc_100128464824.0x000001