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2. C. Bothe, Asphalt, in: B.H. Berrie (Ed.), Artist. Pigment. A Handb. Their Hist. Charact., Volume 4, Archetype Publications Ltd., London, 2007: pp. 111–149.
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4. The Artist’s Assistant Oil Painting Instruction Manuals and Handbooks in Britain 1800–1900 With Reference to Selected Eighteenth-century Sources;Carlyle,2001
5. Molecular Studies of Asphalt, Mummy and Kassel Earth Pigments, Their Characterisation, Identification and Effect on the Drying of Traditional Oil Paint;Languri,2004