http://dewey.info/scheme/a14/ en
621.38 Electronics, communications engineering
621.383 Telegraphy
http://dewey.info/scheme/a14/ vi
621.38 Điện tử, kỹ thuật truyền thông
621.383 Điện báo
http://dewey.info/scheme/a14/ it
621.38 Ingegneria elettronica, delle comunicazioni
621.383 Telegrafia
http://dewey.info/scheme/edition/e23/ en
621.38 Electronics, communications engineering
621.383 Telegraphy
http://dewey.info/scheme/edition/e22/ de
621.38 Elektronik, Kommunikationstechnik
621.383 Telegrafie
Dewey Decimal Classification
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