I am trying to understand Deligne's 'Categories Tensorielles', and therefore I need some knowledge on linear categories. Looking at Wikipedia and nLab, I found some definitions and explanations, but I could not find any references to a book that covers this topic.


Can anyone recommend a good book in which linear categories are discussed?



Literature on linear categories
Linear categories are not an independent subject of study, they usually appear in combination with other types of categories, for example abelian and/or monoidal. For all this stuff see:



> 
> P.Etingof, S.Gelaki, D.Nikshych, V.Ostrik, *Tensor Categories* (2015)
> 
> 
> 


Note, that the concept of a linear category is a special case of that of enriched category. It is rather general concept, but it may be useful to look at the [nlab article](https://ncatlab.org/nlab/show/enriched+category) to understand the general picture.


