Johnsen, J. S. (1997). Conservation management and archival survival of photographic collections. Acta Universitatis Gothoburgensis.
Lua i Stíl Chicago (17ú heag.)Johnsen, Jesper Stub. Conservation Management and Archival Survival of Photographic Collections. Göteborg, Sweden: Acta Universitatis Gothoburgensis, 1997.
Lua MLA (8ú heag.)Johnsen, Jesper Stub. Conservation Management and Archival Survival of Photographic Collections. Acta Universitatis Gothoburgensis, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.