# Introduction to sources
# A Manga Reader Without Servers
When developing a Manga Reader, first and foremost, you need to gather your content from somewhere. There are many services out there, such as WebToons or MangaDex which run their own content providing system which their applications can attach to without many issues.
If you do not hold this kind of infrastructure, as Paperback does not, the app needs to be designed in a way where it can dynamically read other content providers.
This design paradigm has many benefits. The Apple App Store is very restrictive on content provided to iOS and iPadOS devices, however with a generic source system which can be added into the application at runtime allows all sorts of content to be made available, only requiring the users to install each module correctly.
Enter the Paperback Extension system. If you are familiar with Tachiyomi (opens new window) this system is practically the same. Users are free to develop an extension completely independent with the Paperback application builds and updates, and publish generic sources which are simply parsing definitions which understand how to import the contents of X website.
# Where do I start?
Developing a source is pretty easy, you only need basic programming knowledge. Some understanding of git may help but is not required.
Validate that the website you intend to write for is not already available. A list of sources can be found on the repositories list.
Check out the quickstart guide for a place to begin.
Use on of our guide and tutorial to learn more about source development:
Read comments in Extensions Common (opens new window) to learn more about available methods.