1. Lowe, D., and Hall, W.: ‘Hypertext and the Web – an engineering approach’, (John Wiley & Sons Ltd. 1998)
2. Fenton, N.E., and Pfleeger, S.L.: ‘Software metrics – a rigorous and practical approach’, (PWS Publishing Company and International Thomson Computer Press 1997)
3. Measuring the readability and maintainability of hyperdocuments
4. The evolution of Websites