Cite
MLA Citation
British Standards Institution,. Specification for black bolts, screws and nuts, hexagon and square, with B.S.W. threads, and partly machined bolts, screws and nuts, hexagon and square, with B.S.W. or B.S.F. threads.. London : British Standards Institution, 1953. http://access.bl.uk/ark:/81055/vdc_100104918378.0x000001