The Xivkyn Style can be found inside any of the 6 Treasure Vaults of the Imperial City. Entry is gained by collecting 60 of one type of purple Treasure Items dropped by mobs throughout the City & Sewers.
The Glass Style can only be acquired through completing any of the Equipment Crafting Writs. You collect 10 Fragments then spend 10,000 gold to buy a Methric something from a Mystic, then you can assemble your 10 Fragments into 1 Chapter of the Glass Style.
Both of these styles come in Chapters similar to the Dwemer Style, but have a VERY small chance of getting an entire book via the same method as finding a Chapter.
The only styles I know of for AP are the Akaviri motifs. Crown posted some nice screenshots of prices and the gear (excluding medium) here: http://forums.elderscrollsonline.com/en/discussion/222670/akaviri-images
There is also the Mercenary Style, which is obtained from running undaunted pledges. Chapters drop from the key chests. Laurels are obtained from the final dungeon bosses, with your chance increasing based on the number of pages your character has learned - one page starts you off at a 50% chance.