Looking for reference for Apples A5 cache size I saw http://en.wikipedia.org/wiki/Apple_A5 where they tell that the L2 in Apple A5 is 1MB, however, I could not find any official reference or white paper or research publication of it, even though I searched both Google and Google Scholar.

Would you kindly give an idea of or pointer on how can I search for that. I would be grateful for your help.
Detailed specs on Apple's processors for iOS devices are usually not mentioned. Mosty likely as Apple's focus is on a product's performance as a whole. Mere numbers for memory, cache and clocks don't reflect that.
Therefore, even a professional blog such as AnandTech draws such information from running a GeekBench test:
L2 Cache is 1MB and shared among both cores.
But note that these are not official numbers confirmed by Apple.

[picture from AnandTech]