On- and off-hook (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "On- and off-hook" in English language version.

refsWebsite

Global rank English rank

6^th place

6^th place

archive.org (Global: 6^th place; English: 6^th place)

Rey, R. F. (1984). "Engineering and Operations in the Bell System, 2nd Ed". Bell Telephone Laboratories. p. 267. Retrieved 19 March 2017.