1. Bailey, I. W. 1913. The preservative treatment of wood. II: The structure of the pit membranes in tracheids of conifers and their relation to the penetration of gases, liquids, and finely divided solids into green and seasoned wood. Forestry Quarterly 11: 12?20. Reprinted in ?Contributions to Plant Anatomy? by I. W. Bailey (1954). Chronica Botanica Company. Waltham, Mass. USA. 259 pp.
2. Barnett, J. R. 1971a. Winter activity in the cambium of Pinus radiata. N.Z.J.For. Sci. 1: 208?222
3. Barnett, J. R. 1971b. Electron-microscope preparation techniques applied to the light microscopy of the cambium and its derivatives in Pinus radiata D. Don. J. Microsc. 94: 175?180
4. Barnett, J. R. 1973. Seasonal variation in the ultrastructure of the cambium in New Zealand grown Pinus radiata D. Don. Ann Bot. 37: 1005?1011
5. Clowes, F. A. L.; Juniper, B. E. 1968. Plant cells. Blackwell Scientific Publications. Oxford and Edinburgh, 546 pp.