Rami Arieli: "The Laser Adventure" Chapter 10 Section 3, page 16
Reflection Holograms
In thick holograms, since there is another dimension which influence the reference reconstructing beam, it is possible to view the image using reflected beam (like viewing a picture on the wall).
For this, the Reference beam during recording must come from the opposite side of the Object beam.

The observer is at the same side as the illumination source, which can be white light, as seen in figure 10.9.

 
Figure 10.9a: Reflection Hologram, Recording with laser.
 
Figure 10.9b: Reflection Hologram, reconstructing in white light.