1. Hubka, V and Eder, W E Theory of Technical Systems Springer-Verlag, New York (1988)
2. Pahl, G and Beitz, W Engineering design Design Council, London (1988)
3. Jones, J C Design methods Van Nostrand Reinhold, New York (1992)
4. Ullman, D G The mechanical design process McGraw-Hill, New York (1992)
5. Cross, N Engineering design methods Wiley, Chichester (1994)