The readme says this:
La s?rie ang?lus est un plugin gratuit pour Morrowind, les ?l?ments des dossiers SKYCITYmeshes et/ou portant la mention KLN_ sont libres d'utilisation. En aucun cas ils ne peuvent ?tre utilis?s dans un but commercial !!!!!
which roughly means:
The Angelus series is a free mod for Morrowind, the files from the folders SKYCITYmeshes and/or those with the prefix KLN_ are free of use. They cannot be used for commercial purposes.
For all the meshes concerned by this I think you'd only have to credit Archange, the author of the mod, but I think for all the other meshes and textures you'd have to determine who created them and ask them directly.
To help you in this, I also translated the credits:
Bodies of the Angelus race == Better Bodies and the BB team
-Plants in the museum == Vagashan
-Cemetery meshes == Barabus
-Faces and hairs == Rhed, CanadianIce, Khalazza, Andyguy.
-display cases in the Great Hall == Lady E
Clothings :
- Andyguy (AJT)
- Aleanne
-CanadianIce
- Korana
- E-bride, Blast-X & Oni-K.
- Phijama
- Silaria
-? BB loinclothes ?
Animations :
-Qarl
-Metzouk
Weapons:
- Star Boi (Starwind)
- Fidel (Reaver)
Fish :
- Cait
Fairies :
-Lady-Eternity
Architecture
- AutoCAD
-Barabus
-Dan North
-Fidel
-Vagashan (Gothique, D'ni, etc?)
-Eric Henry (boat mesh)
Fruit meshes
-Lady-Eternity
Music
-Sally Fletcher (classical music)
-Dennis Martin
Hope this helps!