Guild Wars 2

So i´ve been trying to get some crafting going, never payed to much attention to it, and i´ve found on the guides that there are a lot of recipes that requires unlock, i´ve never found a recipe vendor for this stuff, can someone help me out here, this one for example which is really simple.
http://www.gw2db.com/recipes/leatherworker?page=10 Check last recipes

Never made one of the recipe sheets myself but from my understanding you use the mystic forge to create the sheet.

http://wiki.guildwars2.com/wiki/Mystic_Forge/Other_Items#Recipe_sheets

simplesimon is correct, recipes for satchels/boxes of armor are made in the mystic forge, using the chest piece of the armor set that you would like to create, plus Bottles of Elonian Wine, Crystals and mystic coins, the amount of those items depends on the tier of armor you would like to create.

Be aware though, even if you have the recipe for crafting a full set armor, you will still need the same amount of ingredients to craft it as if you would craft each piece individually.

thanks a lot guys!