Douglas, J. L. (1980). A research study of natural organic resins and applied painting treatment reports.
Chicago-referens (17:e uppl.)Douglas, Jane L. A Research Study of Natural Organic Resins and Applied Painting Treatment Reports. Florence, Italy, 1980.
MLA-referens (8:e uppl.)Douglas, Jane L. A Research Study of Natural Organic Resins and Applied Painting Treatment Reports. 1980.
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