Are there different types of service a community can perform through books, according to Sai's tradition?

Yes, Chapter 0 describes how a Sadguru takes two types of service from devotees through books. The first is when the Guru creates a great work themselves. The second, which is more applicable for community building, is when the Guru has their biographies written through devotees. The community then accepts this service by engaging in the study and performance of Parayans of that biography. This act of collective study of a text like the 'Shri Sai Satcharita' is considered a profound form of service for the entire congregation of devotees.