Hlp.im doing my a2 psychology coursewrk.im doing it on eye witness testimony+leading ?s any1 no studies on it?

thanks. ive got to do my own experiment for it so i am going to record some1 shop lifting. then put my participants into 2 groups. in first group i will give them a leading ? and in the 2nd group give them a non-leading ?. any1 know any studies/research or theories on this. i know the loftus and palmer 1 (1974). any others? thanks!!! :)