Firth Brown Tools Ltd. (1957). The Speedicut manual of screw thread tools. Firth Brown Tools Ltd..
Cita Chicago (17th ed.)Firth Brown Tools Ltd. The Speedicut Manual of Screw Thread Tools. Sheffield: Firth Brown Tools Ltd., 1957.
Cita MLA (8th ed.)Firth Brown Tools Ltd. The Speedicut Manual of Screw Thread Tools. Firth Brown Tools Ltd., 1957.
Atenció: Aquestes cites poden no estar 100% correctes.