1. American Wood Preservers Association 1971: Specification for waterborne preservatives. AWPA standard P5-71
2. American Society for Testing and Materials 1971: specification for chromated copper arsenate. ASTM standard D1625-68
3. Butcher, J. A.; Nilsson, T. 1982: Influence of variable lignin content amongst hardwoods on soft-rot susceptibility and performance of CCA preservatives. International Research Group on Wood Preservation Document IRG/WP/1151, Stockholm, Sweden
4. Butcher, J. A. 1983: Private communications
5. Garbutt, D. 1985: Institute for Commercial Forestry Research, Pietermaritzburg, South Africa. Personal communication.