1- ASTM (American Standards on Textile Materials, Designations: D-1175).
2- ASTM (American Standards on Textile Materials, Designations: D-1295).
3- ASTM (American Standards on Textile Materials, Designations: D-1388).
4- ASTM (American Standards on Textile Materials, Designations: D-3776).
5- ASTM (American Standards on Textile Materials, Designations: D-5035).
6- Doubling Machine, Instruction Manual for Maintenance, SAVIO AES.12 Machinery, Itd., Italy, 2003.
7- High Speed Doubler Winder No.23, Instruction Manual for Maintenance, Murata Machinery, Itd., Italy, 1998.
8- https://www.saviotechnologies.com/en/twisting/sirius, Search Date: 27 Aug. 2022.
9- https://www.textileadvisor.com/2021/03/different-types-of-fancy-yarns.html, Search Date: 21 June 2022.
10- https://www.textiletoday.com.bd/basic-idea-fancy-yarn, Search Date: 21 June 2022.
11- Kulkarni, H.S., (1992), TWO-FOR-ONE Technology & Techniques for spun yarn, Murthy Tecoya Publication, India.