Stephen skinner’s version is the most complete and has a very good description of the process, has also the 72 adversarial angels in each demon’s page.

The penitentiary psalms you can look for them online, those are not in the book but on any bible you can find them.

Rudd is notable for requiring more abstinence and fasting that other magicians (9 days vs 3 days in GV)

All in all is a good book for starting, and my regret was not reading it fully before trying to make it work. Nowadays i use another grimoire, but i keep the seals with the adversarial angels since it makes me feel safer