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AutoCAD 3D Tutorial book self is a basic 2D object to form 3D Object. You need some command to convert line into polyline, soo the objects can be extrude. Below the steps to create 3D Book Self and the video.
First you need to active all object snaps. Type OS -> Enter -> Select All -> Enter.
By using Pline, Line or Rectangle you can create 2D object like shown figure below. You can combine with another command, like copy or mirror.
To convert an object you can use pedit command, or using pline or rectange to create new object.
Finaly you can use extrude command to convert an object into 3D. And using subtract command to create holes at the object.