https://www.ecatholic2000.com/cathopedia/vol9/volnine210.shtml
Liber Diurnus Romanorum Pontificum — Catholic Encyclopedia (1913)
Liber Diurnus Romanorum Pontificum — full article from the original 1913 Catholic Encyclopedia (Volume 9). Free online Catholic reference.
liber diurnuscatholic encyclopediaromanorumpontificum
https://nvht-lacerta.nl/artikel/de-zadelsprinkhaan-ephippiger-diurnus-als-sleutelsoort-op-de-veluwe/
De Zadelsprinkhaan (Ephippiger diurnus) als sleutelsoort op de Veluwe – NVHT Lacerta
zadelsprinkhaanephippigerdiurnusalsveluwe