840 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "840" in English language version.

Last modified: 21:35:14, 29 October 2026 (UTC)

Ref.Un. Ref.Website

Global rank English rank

11annalsofgeophysics.eu

low place

low place

2^nd place

2^nd place

11britannica.com

37^th place

64^th place

annalsofgeophysics.eu (Global: low place; English: low place)

Guidoboni, Emanuela; Traina, Giusto (1995). "A new catalogue of earthquakes in the historical Armenian area from antiquity to the 12th century". Annals of Geophysics. 38 8: 121. doi:10.4401/ag-4134.

britannica.com (Global: 37^th place; English: 64^th place)

"History of Central Asia". Britannica.

doi.org (Global: 2^nd place; English: 2^nd place)

Guidoboni, Emanuela; Traina, Giusto (1995). "A new catalogue of earthquakes in the historical Armenian area from antiquity to the 12th century". Annals of Geophysics. 38 8: 121. doi:10.4401/ag-4134.