APA
Llewellyn J., Edwards S. & Building Research Establishment. (1998). Towards a framework for environmental assessment of building materials and components. London: CRC Ltd.
Chicago
Llewellyn J.W, Edwards S and Building Research Establishment. 1998. Towards a framework for environmental assessment of building materials and components. London: CRC Ltd.
Harvard
Llewellyn J., Edwards S. and Building Research Establishment. (1998). Towards a framework for environmental assessment of building materials and components. London: CRC Ltd.
MLA
Llewellyn J.W, Edwards S and Building Research Establishment. Towards a framework for environmental assessment of building materials and components. London: CRC Ltd. 1998.