I am currently reading Mark Baker's new book and am really enjoying it.  It is more of a coaching type book so far and have not come across anything pertaining to practicing.

For me, I go into my practice sessions with a goal in mind.  I know in advance what I want to accomplish.  I have my videocamera ready if I'm using it.  But what I don't do is keep score.  I work on my game for 1-1.5 hours and limit it to that.  Anything beyond that and I run the risk of losing focus and gaining bad habits. 

The goal is to work on the process of the approach and ball release, not the score.  Once you are able to separate the two and only worry about the process, then better scores will come.

when i practice,i try to work on things individually and and than in the whole approach my be release,grip,armswing,than go with a full swing and not think about it be fluid

As the others have said, one thing at a time is best.  Also, don't be afraid to videotape yourself.  I've used my cell phone to do that before (stand it up in my sneaker and zoom in to get a good shot of the whole lane).  It helps in finding out things I don't see.

Here's a link to an article in the April issue of U.S. Bowler magazine. It's on the bowl.com website. There's an article called "The One Week Workout, Practice Makes Perfect". Something you may want to consider.

http://content.yudu.com/A1w86w/USB0412/resources/index.htm?referrerUrl=http%3A%2F%2Fbowl.com%2Fusbowler%2F