Appelbaum, B (1991) Guide to environmental protection of collections. Sound View Press. ISBN 0-932087-16-7

Arnold, A and Zehnder, K (1991) Monitoring Wall Paintings Affected by Soluble Salts. In: The conservation of wall paintings; proceedings of a symposium organized by the Courtauld Institute of Art and the Getty Conservation Institute, London, July 13-16 1987. Getty Conservation Institute , pp. 103-135. ISBN 0-89236-162-X

Camuffo, D (1991) Wall temperature and the soiling of murals. Museum Management and Curatorship, 10 (4). pp. 373-383. ISSN 02604779

Huynh, C K and Savolainen, H and Vu-Duc, T and Guillemin, M and Iselin, F (1991) Impact of thermal proofing of a church on its indoor air quality: The combustion of candles and incense as a source of pollution. The Science of The Total Environment, 102. pp. 241-251. ISSN 00489697

Park, S C (1991) Heating, Ventilating, and Cooling Historic Buildings - Problems and Recommended Approaches. TPS Preservation Briefs (24).