1. K. West and N. M. MacInnes in ‘The Yarn Revolution’ (edited by P. W. Harrison), the Textile Institute, Manchester, 1976, p.77.
2. K. West and N. M. MacInnes in ‘The Yarn Revolution’ (edited by P. W. Harrison), the Textile Institute, Manchester, 1976, p.77.
3. A. Krieger in ‘The Yarn Revolution’ (edited by P. W. Harrison), the Textile Institute, Manchester, 1976, p.130.
4. K. Greenwood and O. T. Stutz in ‘The Yarn Revolution’ (edited by P. W. Harrison), the Textile Institute, Manchester, 1976, p. 89.
5. A. Krieger in ‘The Yarn Revolution’ (edited by P. W. Harrison), the Textile Institute, Manchester, 1976, p.130,