I think it's probably better to get the rules directly from the WNT website than to go to Scribd.
Here is the current pertinent section:
7. Unsporting Conduct
(a) In the event of
(i) any conduct by a player which in the opinion of an official is willfully or persistently Unsporting; or
(ii) any other conduct by a player which otherwise amounts to Unsporting Conduct; or
iii) any player refusing to continue the current rack; an official shall warn the player that in the event of any further Unsporting Conduct the rack will be awarded to their opponent.
(b) If the official has warned the player under (a) above, in the event of any further Unsporting Conduct, the official shall award the rack to their opponent, or, if this happens between racks, the referee shall award the next rack to their opponent, and the official shall warn the player that in the event of any further Unsporting Conduct the match will be awarded to their opponent.
(c) If an official has awarded a rack to a player’s opponent, under (b) above, in the event of any further Unsporting Conduct by the player concerned, the official shall award the match to the player’s opponent. [/URL]