4 (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "4" in German language version.

refsWebsite

Global rank German rank

2,224^th place

612^th place

ethz.ch (Global: 2,224^th place; German: 612^th place)

Herbert Bruderer: Zeitrechnung. Bodenseeverlag Bruderer, Rohrschach, 2011