References

Not to be confused with resources, these are references we may use. Be sure to cite everything; good practice is as soon as possible. Cite in MLA style (unless we're supposed to use something else).

No longer used

For smoke from machine I used this as a reference (Eric): http://salvador.mata.com.mx/blog/2006/11/volumetricos-tutorial-para-blender/

Used sources

Tennis machine textures are from http://www.cgtextures.com/
Blender Magazine issue 16 p. 17 realistic smoke - http://blenderart.org/issues/#
Tennis ball modeling tutorial - http://blenderartists.org/forum/showthread.php?t=73937
Audio is not ours but it will take too long to track down the sources so just say so.
Official blender documentation.