Andrews, H. (1804). Paeonia suffruticosa. Botanists Repository, 6, t.373. Booth,M.H.(1960). The Moutan or Tree Peony Boyd, J. (1928). Peonies. The Manual of the American Peony Society. Harrisburg, Pennsylvania. Davis, P. H. and Stearn, W. T. (1984). Peonies of Greece. The Goulandris Natural History Musem, Kifissia, Greece. Farrer, R. J. (1917). On the Eaves of the World. 1: 110-113. Arnold. Fernley-Whittingstall(1999). Peonies The Imperial Flower Frank, R. (1999) Päonien. Pfingstrosen. Stuttgart: Ulmer Good, Walter (1997). Nassos Daphnis – A life for art and peonies. Bulletin of The American Peony Society, 302: 23-35. Halda, J. J. and Waddick, J. W. (2004). The Genus Paeonia. Timber Press, Portland, Oregon. Harding, A. (1993). The Peony. Introduced and updated by Roy G. Klehm. B. T. Batsford Ltd., London. Hashida, R. (1990). A Book of Tree and Herbaceous Peonies in Modern Japan, Tatebayashi City, Japan: Japan Botany Society. Haw, S (2001) Tree Peonies – A review of their History and Taxonomy. The New Plantsman, 8 (3): 156-171. Haw, S. G. and Lauener, N. E. (1990). A review of the intraspecific taxa of Paeonia suffruticosa Andrews. Edinburgh Journal of Botany 47 (3): 273-281. Hong, De-Yuan (2010).Peonies of the World: Polymorphism and Diversity.Royal BVotanic Gardens Hong, De-Yuan (2011).Peonies of teh World: Taxonomy and Phytogeography.Kew Gardens.
Kemularia-Nathadze, L. M. (1961) Caucasian Representatives of the Genus Paeonia L. Transactions of the Tbilisi Botanical Institute,  21, 51p. Tbilisi, Georgia. Lianying, Wang et al. (1998) Chinese Tree Peony. The Peony Association of China, China Forestry Publishing House. Lynch, R. I. (1890). A new classification of the genus Paeonia. Journal of the Royal Horticultural Society. London, 12: 428-445. McLewin, W. and Chen, D. (2006) Peony rockii and Gansu Mudan. Wesseley, MA.: Wesselley Cambridge Press Needham, J., Gwei-Djen, L. and Hsing-Tsung, H. (1986). Science and Civilisation in China, Volume 6, Biology and Biological Technology, Part I: Botany: 394-409.
Osti, G. L. (1999). The Book of Tree Peonies, Umberto Allemandi & C., Turin. Osti, G.L. (2006). The Book of Mediterranean Peonies. Umberto Allemandi & C., Turin. Özhatay, N. Page, M. and Sinnott, M. (2000). Paeonia turcica. Curtis’s Botanical Magazine, t.390: 92-97. Page, M. L. (1997). The Gardener’s Guide to Growing Peonies. David and Charles, Newton Abbot. Page, M. L. (2007). The Gardener’s Peony. Timber Press, Portland. Page, M. L. (2005). Paeonia Itoh Hybrids. The New Plantsman. pp 36-39. Page, M. L. and Sinnott, M. (2001). Paeonia japonica. Curtis’s Botanical Magazine. 413: 79-84. Peyton, G (1943). ‘Outstanding Peonies’.  American Peony Society Bulletin, 51. Rogers, A. (1995). Peonies. Timber Press. Portland, Oregon. Stern, F.C. (1939). The Moutan Tree Peony. Journal of the Royal Horticultural Society, 64: 550-552. Stern, F.C. (1946). The Genus Paeonia. Royal Horticultural Society. London.  
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Kelway, J. (1954). Garden Paeonies. Eyre & Spottiswoode, London.