Hussar
Legend
James Jacobs said:Herremann the Wise is correct (and wise as well, I hear!). We assume readers of Dungeon have access only to the three core books. We often use material form other WotC books (especially monsters), but whenever we do, we reprint all the rules you need to use the non-core element in your game. For monsters, we also make sure to give a description of the creature (especially if we aren't illustrating it), although the free online art at WotC's site is really handy for this.
Cool beans.
Got a birthday coming up. This answer just got you a new subscriber come October when the new AP starts. Well done you.