There are two bibles in the world of Scrabble. There's the American bible, the Official Tournament and Club Word List, and there's the British bible. Official Scrabble Words, 4th Edition. Both sources are used widely throughout the world that plays English-language Scrabble. Some countries use one or the other source, and some countries use both sources together. The combination of these two sources is often referred to as "world dictionary".
"Fifteen-Letter Transdeletion Pyramids,"
Word Ways: Vol. 34
, Article 7.
Available at: http://digitalcommons.butler.edu/wordways/vol34/iss2/7