Selecting source for the clone brush - Materials and Textures - Blender Artists Community
Setting origin of empty "group" object - Blender Stack Exchange
Copy object color from an intersecting object - Materials and Textures - Blender Artists Community
Extensions:2.6/Py/Scripts/3D interaction/Copy Attributes Menu - wiki
In Blender, the orientations (XYZ) of an object in the viewport have become skewed. How do I fix them to align with the object without replacing it? - Quora
What is an empty? - Blender Stack Exchange
Precision work in Blender :: Blender Mama
Empties — Blender Manual
Blending with Blender: Getting Started | SpringerLink
13. Creating the Materials in Blender Internal | Blender 3D: Characters, Machines, and Scenes for Artists