1. Cohen, M. A. and Shanks, J. 1975. Effect of N-6-BA, GA3, and removal of terminal buds on dwarf shoot development in Pinus ponderosa. Journal American Society Horticultural Science 100 (4): 404?406.
2. Hartmann, H. T., Kester, D. E. and Davies, F. T. 1990. Plant Propagation: Principles and Practices. Prentice-Hall Inc., New Jersey. 727 p.
3. Heidmann, L. J. 1989 Induction of buds on juvenile conifers with N-6-benzylaminopurine and phloroglucinol. North American Plant Propagator (1): 12?13, 16.
4. Kossuth, S. V. 1980. Pre-treatment for cloning slash and scotch pine. Proceedings, Florida State Horticultural Society 93: 112?114.
5. Little, C. H. A. 1984. Promoting bud development in balsam fir Christmas trees with 6-benzylaminopurine. Canadian Journal of Forestry Research 14: 447?451.