Carlsson J. 2012. The effect of arginine on root system development in Norway spruce (Picea abies L. Karst) somatic embryos. PhD thesis Swedish University of Agricultural Sciences, Faculty of Forest Sciences, Department of Forest Genetics and Plant Physiology.
Chawla H. 2000. Introduction to plant biotechnology. Science Publishers, Inc, India.
Girouard R. 1974. Propagation of spruce by stem cuttings. New Zealand Journal of Forestry Science 4, 140-149.
Gómez M. and J. Segura. 1995. Axillary shoot proliferation in cultures of explants from mature Juniperus oxycedrus trees. Tree Physiology 15, 625-628.
Hakman I, Fowke L.C, von Arnold S, Eriksson T. 1985. The development of somatic embryos in tissue cultures initiated immature embryos of Picea abies (Norway spruce). Plant Science 38, 53-59.
Hartmann H, Kester D. 2011. Plant propagation: principles and practices, Pearsons, 8th Edition.
Hartmann H, Kester D, Davies J. 2002. Plant propagation: principles and practices. New Jersey: Prentice-Hall, 7th Edition.
Libby W. 1974. Use of vegetative propagules in forest genetics and tree improvement. New Zealand Journal of Forestry Science 4 (2), 440-447.
Murashige T. 1974. Plant propagation through tissue cultures. Annual Review of Plant Biology 25, 135-166.
Murashige T, Skoog F. 1962. A revised medium for rapid growth and bio assays with tobacco tissue cultures. Physiologia Plantarum 15, 473-497.
Piola F, Rohr R. 1996. A method to overcome seed and axillary bud dormancy to improve Cedrus libani micropropagation. Plant Tissue Culture and Biotechnology 2, 199-201.
Shelburne C, Thulin I. 1974. Early results from a clonal selection and testing programme with radiata pine. New Zealand Forest Service 4, 378-398.
Stange C, Prehn D, Gebauer M, Arce-Johnson P. 1999. Optimization of in vitro culture conditions for Pinus radiata embryos and histological characterization of regenerated shoots. Biological Research 32, 19-28.
Sutton B. 2002. Commercial delivery of genetic improvement to conifer plantations using somatic embryogenesis. Annals of Forest Science 59, 657-661.
Sweet G, Wells L. 1974. Comparison of the growth of vegetative propagules and seedlings of Pinus radiata. New Zealand Journal of Forestry Science 4 (2), 399-409.
Thorpe T, Harry I, Kumar P. 1991. Application of Micropropagation to Forestry. In: Micropropagation. Springer.
Verhagen S.A, Wann S.R. 1989. Norway spruce somatic embryogenesis: high frequency initiation from light cultured mature embryos. Plant Cell Tissue and Organ Culture 16, 103-111.
Von Arnold S. 1982. Factors influencing formation, development and rooting of adventitious shoots from embryos of Picea abies (L.) Karst. Plant Science Letters 27, 275-287.
Von Arnold S, Eriksson T. 1979. Bud induction on isolated needles of Norway spruce (Picea abies L. Karst.) grown in vitro. Plant Science Letters 15, 363-372.
Warren R. 1982. Spruces in the Arnold arboretum. Arnoldia.