Dyfyniad APA

British Standards Institution. Specification for engineers' parallels (1st revision.). B.S.I.

Dyfyniad Arddull Chicago

British Standards Institution. Specification for Engineers' Parallels. 1st revision. London: B.S.I.

Dyfyniad MLA

British Standards Institution. Specification for Engineers' Parallels. 1st revision. B.S.I.

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