pp.  300–. . 
 - philips, Roger (1979). trees of North america and Europe. New York: Random house, inc.. . 
 - phillips, D. H. & Burdekin, D. A. (1992). Diseases of Forest and Ornamental trees. Macmillan. .
pp.  300–. . 
 - Philips, Roger (1979). Trees of North America and Europe. New York: Random House, Inc.. . 
 - Phillips, D. H. & Burdekin, D. A. (1992). Diseases of Forest and Ornamental Trees. Macmillan. .
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