Hard mode elite tomes

Hi I'm just new on this forum blabla, but I was asking I like to farm in guild wars and ecpecialy with the new "hard mode" but those elite tomes.
Is there for every boss on hard mode a chance to drop a elite tome? Or just a few specific bosses? hope to get a responce fast ty

I beleive a boss can always drop its profession's elite tome...I think..

Every boss in hard mode can drop a tome of its profession.

Regular mobs drop regular tomes.

Bosses drop elite tomes.

Ok ty you all for helping me