1. Armfield Technical Education Equipment Division, undated. Fluid friction apparatus model C6. Issue 1. Ringwood, Hampshire, England: Armfield Engineering Limited.
2. Armfield, undated. Fluid friction apparatus model C6. Issue 1. Ringwood, Hampshire, England: Armfield Technical Education Company Limited.
3. Armfield, 1980. Instruction manual for C6 fluid friction apparatus. Issue 2. Ringwood, Hampshire, England: Armfield Technical Education Company Limited.
4. Experimental Study on Flow-Resistance Law for Small-Diameter Plastic Pipes
5. Friction Factors for Small Diameter Plastic Pipes