4 (Foreigner album) (English Wikipedia)

"Le Détail des Albums de chaque Artiste – F". Infodisc.fr (in French). Archived from the original on 22 October 2014. Retrieved 9 June 2012. Select Foreigner from the menu, then press OK.
"French album certifications – Foreigner – 4" (in French). InfoDisc. Retrieved 9 September 2021. Select FOREIGNER and click OK.

loudersound.com

Jeffries, Neil (July 2, 2016). "The Strange And True Story of Foreigner 4". Classic Rock. Louder Sound. Retrieved 2022-06-17.
"Foreigner - Foreigner 4: Album Of The Week Club Review". Classic Rock. Louder Sound. October 9, 2018. Retrieved 2022-06-17.
Dome, Malcolm (17 June 2016). "The Top 10 Most Underrated Foreigner Songs". Classic Rock. Louder Sound. Retrieved 2022-06-17.
"Mick Jones' 11 Favourite Foreigner Songs". Classic Rock. Louder Sound. April 26, 2017. Retrieved 2022-06-17.

Eric Minton (September 19, 1981). "Rick Wills of Foreigner is happy to be a juke box hero". The Sun. p. 18. Retrieved 2022-06-18 – via newspapers.com.

"Offiziellecharts.de – Foreigner – 4" (in German). GfK Entertainment Charts. Retrieved 3 April 2022.
"Top 100 Album-Jahrescharts" (in German). GfK Entertainment Charts. 1981. Archived from the original on 19 October 2021. Retrieved 3 April 2022.
"Top 100 Album-Jahrescharts" (in German). GfK Entertainment Charts. 1982. Archived from the original on 19 October 2021. Retrieved 3 April 2022.

Sawday, Evan (November 26, 2014). "Foreigner: The Complete Atlantic Studio Albums 1977-1991". PopMatters. Retrieved 2023-02-05.

Stone, Mee-Lai (26 November 2014). "Hipgnosis' mind-bending album art – in pictures". The Guardian.

Wardlaw, Matt (May 2, 2015). "Top 10 Foreigner Songs". Ultimate Classic Rock. Retrieved 2022-01-08.
Rivadavia, Eduardo (May 2, 2013). "Top 10 Underrated Foreigner Songs". Ultimate Classic Rock. Retrieved 2022-01-08.

"Anecdotes, "Curio Corner" - Foreigner - Silent Partners". Archived from the original on 2012-02-26. Retrieved 2009-08-13.
Audio Revolution review Archived 2016-03-04 at the Wayback Machine of Foreigner’s 4 DVD-Audio.
Warner Premium Sound 14 September releases Archived August 13, 2011, at the Wayback Machine (in Japanese). Retrieved 2011-11-03.
"Le Détail des Albums de chaque Artiste – F". Infodisc.fr (in French). Archived from the original on 22 October 2014. Retrieved 9 June 2012. Select Foreigner from the menu, then press OK.
"Top 100 Album-Jahrescharts" (in German). GfK Entertainment Charts. 1981. Archived from the original on 19 October 2021. Retrieved 3 April 2022.
"Top 100 Album-Jahrescharts" (in German). GfK Entertainment Charts. 1982. Archived from the original on 19 October 2021. Retrieved 3 April 2022.

"Music Week" (PDF). p. 28.
"Foreigner is no stranger Down Under" (PDF). Cash Box. September 3, 1983. p. 17. Retrieved December 7, 2021 – via World Radio History.