http://dewey.info/scheme/a14/ en
621.38 Electronics, communications engineering
621.389 Security, sound recording, related systems
http://dewey.info/scheme/a14/ vi
621.38 Điện tử, kỹ thuật truyền thông
621.389 An ninh, ghi âm, các hệ thống liên quan
http://dewey.info/scheme/a14/ it
621.38 Ingegneria elettronica, delle comunicazioni
621.389 Sistemi di audioregistrazione, sistemi di sicurezza, sistemi connessi
http://dewey.info/scheme/edition/e23/ en
621.38 Electronics, communications engineering
621.389 Security, sound recording, related systems
621.3892 Public address, security, related systems 621.3893 Sound recording and reproducing systems 621.3895 Sonar 621.3897 Audiovisual engineering
http://dewey.info/scheme/edition/e22/ de
621.38 Elektronik, Kommunikationstechnik
621.389 Sicherheits-, Tonaufzeichnungssysteme, verwandte Systeme
621.3892 Lautsprecher-, Sicherheitssysteme, verwandte Systeme 621.3893 Tonaufzeichnungs- und Tonwiedergabesysteme 621.3895 Sonar 621.3897 Audiovisuelle Technik
Dewey Decimal Classification
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