The "Reasoning Book" claims that the 1874 edition of The Imperial Bible Dictionary verifies the idea that Jesus was crucified on a stake.
However, when you check the reference with The Imperial Bible Dictionary, you see that it acutally is not as clear cut as that.
As usual, the infamous "..." of the Watchtower has been used to edit out any opposing ideas in the source that they cite.
I know that this may have been mentioned before, but the scans of The Imperial Bible Dictionary that are floating around the internet are from later editions, hence the page numbers are not those cited in the Reasoning Book.
http://i36.tinypic.com/2ilc9cx.jpg
1st page:
The entire 3 page scan of the Imperial Bible Dictionary's acrticle can be found here as a higher quality PDF without the highlighting shown above:
http://www.filesend.net/download.php?f=0529828d49f3dca5b017ff75c5157f70