1- ASTM (American Standards on Textile Materials, Designations: D- 1423).
2- ASTM (American Standards on Textile Materials, Designations: D- 1425).
3- ASTM (American Standards on Textile Materials, Designations: D- 2256).
4- Compact Twister (For Spun Yarn), (2013), Instruction Manual for Maintenance, Volkmann Saurer Textile Machinery Co., LTd, Germany.
5- Fraser, W.B., Stump, D.M. (1998), Twist in Balanced- ply structures, J. Text. Inst., Vol. 89, part 1, No.3.
6- http://volkmann.saurer.com/en/products/staple-fibre-twisting/compacttwister
7- Kulkarni, H.S., (1992), TWO-FOR-ONE Technology & Techniques for spun yarn, Murthy Tecoya Publication, India.
8- Ozdemir, O., Sardag, S., (2006), Effect of twisting methods on plied yarn properties, Indian Journal of fiber and textile Research, Vol. 31, Issue 3.
9- Two-For-One-Twister (For Spun Yarn) NO.363, (1999), Instruction Manual for Maintenance, Murata Machinery Ltd., Tokyo, Japan.
Two-For-One-Twister (For Spun Yarn), (2003), Instruction Manual for Maintenance, LEEWHA Industrial Co. Ltd., Republic of Korea.