1. Baz, Ahmed, "Design of Sampling Plans for Skein Strength of Yarn Based on the Analysis of Variations," Thesis for Master of Science Degree, School of Textiles, N . C. State College, Raleigh, North Carolina ( 1959).
2. Bornet, George M., Textile Quality Control Papers 5, 39-72 (1958).
3. Grover, E.B. and Hamby, D.S. "Handbook for Textile Testing and Quality Control," N. C. State College ( 1958).