Flettner (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Flettner" in Catalan language version.

refsWebsite

Global rank Catalan rank

8,765^th place

low place

5^th place

5^th place

helis.com

«Flettner» (en anglès). [Consulta: 3 abril 2020].

worldcat.org

Nowarra, Heinz J.. German helicopters, 1928-1945. West Chester, PA: Schiffer Military History, 1990. ISBN 0-88740-289-5.