BIS. (1992). IS: HEXAGON HEAD BOLTS, SCREWS & NUTS OF PRODUCT GRADE C PART 1 IS: 1363-1992. BIS.
Lua i Stíl Chicago (17ú heag.)BIS. IS: HEXAGON HEAD BOLTS, SCREWS & NUTS OF PRODUCT GRADE C PART 1 IS: 1363-1992. NEW DELHI: BIS, 1992.
Lua MLA (9ú heag.)BIS. IS: HEXAGON HEAD BOLTS, SCREWS & NUTS OF PRODUCT GRADE C PART 1 IS: 1363-1992. BIS, 1992.
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