Dear Lea Levi
To my knowledge there is no literature on this subject as it was presented by me, at list not in the passing 25,000 years.

Some ancient writting from the Far East could probably consider it, Prior to the Guru Age. Or they may present more than 7 chakras, probably not the complet set of 18n chakras or the physical connected 13n chakras.

The reason that I teach 10 days, so many hours is because it is efficient - People will need anyhow to reread and rewrite their notebook to bring order to their mind.
The painted set will be ready and so will be the methods to work with each layer that the chakra's layline passes through.
The yearly class is suggested to allow more people to join it - it is possible on evening course once a week.

Kindly see that your questions will not delve into my teaching because it is not in harmony with the rules of this site.

Love and Light
Estia