You will find the following files in this download: 

1. papers_books_pack.blend (Blender file. The blender file is linked to the texture files that you will find in the textures.zip file)

2. papers_books_pack.fbx (Universal format that can be imported into most major 3D modeling softwares)

3. papers_books_pack.mtl

4. papers_books_pack.obj (Universal format that can be imported into most major 3D modeling softwares)

5. textures.zip ( The texture folder contains subfolders that contain texture files for blender, unity game engine, unreal engine, and normal i.e. for all other 3D modeling softwares)