SZD-19 Zefir (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "SZD-19 Zefir" in English language version.

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1web.archive.org

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1muzeumlotnictwa.pl

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flyingtv.pl (Global: low place; English: low place)

[1] 1963 WGC newsreel

muzeumlotnictwa.pl (Global: low place; English: low place)

"SZD-19-2A Zefir 2A". Polish Aviation Museum. Retrieved 9 April 2013.

piotrp.de (Global: low place; English: low place)

Pietchowski, Piotr. "SZD-19-2 Zefir 2" (in Polish). www.piotrp.de. Retrieved 8 April 2013.
Pietchowski, Piotr. "SZD-29". Retrieved 9 April 2013.

smil.org.pl (Global: low place; English: low place)

Śmielkiewicz, Jerzy (September 2006). "Development of "Zefir" gliders" (PDF). Polish Aviation Technology, Historical Notes (26). Archived from the original (PDF) on 24 September 2015. Retrieved 9 April 2013.

web.archive.org (Global: 1^st place; English: 1^st place)

Śmielkiewicz, Jerzy (September 2006). "Development of "Zefir" gliders" (PDF). Polish Aviation Technology, Historical Notes (26). Archived from the original (PDF) on 24 September 2015. Retrieved 9 April 2013.