1. “Coding and recycling thermoplastics parts”, IBM, CS 5-0001-006, 1992
2. “Design for recycling”, GE Plastics, 1991
3. “Ecofactory: concepts and R&D themes” New Technology Japan1992
4. “Environmentally conscious design practices” IBM Semea 1992
5. “Ethos” GE Plastics 1992