[CurryLover]

For Pot Limit Omaha -

Bob Ciaffone: Omaha Hold'em Poker
Bob Ciaffone and Stuart Reuben: Pot Limit and No Limit Poker
Stuart Reuben: How good is your pot limit Omaha?
Dr Mahmood N. Mahmood: The science of poker
Doyle Brunson: Super System II (chpater by Lyle Berman)

For Limit Omaha High/Low -

Ray Zee's: High Low Split poker
Doyle Brunson: Super System II (chapter by Bobby Baldwin)
Mike Cappelletti: How to win at Omaha High-Low poker
Tenner and Krieger: Winning Omaha/8 poker

Both Ciaffone books are essential readingif you play PLO, as is Zee's book if your game is High/low split. Reuben's book is quite good if you like hand quizzes. Dr Mahmood's book is worth buying just for the maths bits. The new Super System has been heavily criticised on these forums. Despite this, I think the PLO section is good for a beginner and is easy to read. Same for the Omaha High Low split section. Cappelletti's book is ok, not great. Tenner and Krieger's book seems to be quite poor, but I've not finished reading it yet.