Adding the background image to Blender - Blender 3D Printing by Example [Book]
How to add a background image in Blender - Quora
How to Render a Background Image in Blender 2.8 Using a Camera Background Image - Henry Egloff
Please add background image feature as in blender 2.79,in blender 2.8 we can't see the background image from front,top and side views - User Feedback - Blender Developer Talk