Q code (English Wikipedia)

"Operating Signals" (PDF). Communications Instructions. March 1997. ACP 131(E). Archived from the original (PDF) on 19 November 2011. Chapter 2 contains a full list of 'Q' codes

arrl.org

"Radio codes & signals – Florida". National Communications Magazine. Retrieved 30 January 2010.

Franklin, 277808-Elizabeth A. "Aero 16 – Polar Route Operations". Archived from the original on 13 November 2001. Retrieved 5 September 2016.{{cite web}}: CS1 maint: numeric names: authors list (link)

Schroeder, Peter B. (29 December 1967). "Contact at Sea: A History of Maritime Radio Communications". Ardent Media – via Google Books.

"The uk.radio.amateur newsgroup" (Post). 21 August 2010. Retrieved 4 August 2013.

"Appendix 13. Miscellaneous Abbreviations and Signals to be Used in Radiotelegraphy Communications Except in the Maritime Mobile Service" (PDF). Radio Regulations. Vol. 1 (revised ed.). Geneva, CH: International Telecommunication Union. 1994 [1990]. pp. 543–568. ISBN 92-61-05171-5. Archived from the original (PDF) on 7 January 2017. Retrieved 7 January 2017.
"International Morse code Recommendation ITU-R M.1677-1". itu.int. International Telecommunication Union. October 2009. Retrieved 23 December 2011.

"RECOMMENDATION 1172". ITU-R M.1172. Archived from the original on 21 April 2015.

"Q-Codes". Archived from the original on 23 March 2009. Retrieved 20 March 2009.

"portland-amateur-radio-club.org.uk" (PDF). Archived from the original (PDF) on 6 October 2011. Retrieved 5 September 2016.

The Free Dictionary. "Definition of QLF". The Free Dictionary. Retrieved 1 July 2016.

"Operating Signals". ARRL National Traffic System (NTS). 12 December 2014. Archived from the original on 2 April 2015. Retrieved 30 March 2015.

Franklin, 277808-Elizabeth A. "Aero 16 – Polar Route Operations". Archived from the original on 13 November 2001. Retrieved 5 September 2016.{{cite web}}: CS1 maint: numeric names: authors list (link)
"portland-amateur-radio-club.org.uk" (PDF). Archived from the original (PDF) on 6 October 2011. Retrieved 5 September 2016.
"Q-Codes". Archived from the original on 23 March 2009. Retrieved 20 March 2009.
"Operating Signals" (PDF). Communications Instructions. March 1997. ACP 131(E). Archived from the original (PDF) on 19 November 2011. Chapter 2 contains a full list of 'Q' codes
"RECOMMENDATION 1172". ITU-R M.1172. Archived from the original on 21 April 2015.
"Appendix 13. Miscellaneous Abbreviations and Signals to be Used in Radiotelegraphy Communications Except in the Maritime Mobile Service" (PDF). Radio Regulations. Vol. 1 (revised ed.). Geneva, CH: International Telecommunication Union. 1994 [1990]. pp. 543–568. ISBN 92-61-05171-5. Archived from the original (PDF) on 7 January 2017. Retrieved 7 January 2017.
"Operating Signals". ARRL National Traffic System (NTS). 12 December 2014. Archived from the original on 2 April 2015. Retrieved 30 March 2015.
"Communications Instructions Operating Signals" (PDF). Combined Communications Electronics Board. April 2006. Archived from the original (PDF) on 6 September 2012. Retrieved 16 May 2014.

Great Britain, Post Office (October 1909). Handbook for wireless telegraph operators working installations licensed by His Majesty's postmaster-general. London: His Majesty's Stationery Office. appendix iii. OCLC 40616664.