Is there a book(s) on obliques?  (Not abs). Please see details.  Any information is very appreciated.  Thank you.?

I used to be really overweight. Then for several months, each day I'd: eat like a champ, only drink water, intense cardio, sit ups, go to bed early, and I lost 45 pounds and 6 inches on my waist! 

At my former gym, I paid for 2 (30-60 minute) lessons: 1 on abs, 1 on obliques. I still have the list of exercises for both. Most abs exercises require: no equipment, or a weight plate, a mat, a medicine ball, a stability ball, a slam ball, + an ab-roller.

Yet, I'm looking at the oblique list of exercises, and most of them require weight machines, an incline bench, and other equipment that is really pricey or is only available at a gym. So, I've only been doing the few ones I can at home :(  The point- My abs look MUCH better (than when I was overweight).  My obliques only look somewhat better :/  I'm gonna keep striving with both.Yet, if within weeks or months I earn 6 pack abs, I DO NOT want to have chubby obliques on the sides of them ;(  I don't plan on rejoining a gym, due to other bills and responsibilities.  Perhaps I could save up and buy each piece of the necessary equipment?I believe the 19 forms of sit-ups the trainer taught me are why my abs look better (I do sets of 20 of them at home each week)I own 2 books on abs: The "The Abs Diet" and "Men's Health: Getting Abs".  Their recommended exercises rock, but they don't (or very rarely) mention the word obliques.  Please no rude or sarcastic answers.  God bless you all.  Are there books on obliques?