Urban Air (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Urban Air" in English language version.

refsWebsite

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5^th place

worldcat.org

Bertrand, Noel; Rene Coulon; et al: World Directory of Leisure Aviation 2003-04, page 166. Pagefast Ltd, Lancaster OK, 2003. ISSN 1368-485X
Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 41. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X