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- Basal, G., Oxenham, W., (2006), Comparison of properties and structure of compact and conventional spun yarns, Textile Research Journal, Vol.76, No.7.
5- Compact Twister (For Spun Yarn), (2013), Instruction Manual for Maintenance, Volkmann Saurer Textile Machinery Co., LTd, Germany.
7- Kulkarni, H.S., (1992), TWO-FOR-ONE Technology & Techniques for spun yarn, Murthy Tecoya Publication, India.
8- Two-For-One-Twister (For Spun Yarn) NO.363, (1999), Instruction Manual for Maintenance, Murata Machinery Ltd., Tokyo, Japan.
9- Two-For-One-Twister (For Spun Yarn), (2003), Instruction Manual for Maintenance, LEEWHA Industrial Co. Ltd., Republic of Korea.