http://dewey.info/scheme/a14/ en
539 Modern physics
539.2 Radiation (Radiant energy)
http://dewey.info/scheme/a14/ vi
539 Vật lý học hiện đại
539.2 Bức xạ (Năng lượng phát xạ)
http://dewey.info/scheme/a14/ it
539 Fisica moderna
539.2 Radiazioni (Energia radiante)
http://dewey.info/scheme/edition/e23/ en
539 Modern physics
539.2 Radiation (Radiant energy)
http://dewey.info/scheme/edition/e22/ de
539 Moderne Physik
539.2 Strahlung (Strahlungsenergie)
Dewey Decimal Classification
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