What are the "official" logos to use when designing an Android and iOS App?

Question

When displaying logos showing that your service is available on mobile app stores, what are the correct logos and names to be used for:

• Apple App Store
• Google Play Store

I knew what they were before but I don't know where to go to check this as, after typing them into Google, there seem to be many variants.

Answer 1

Android has an official guide from Google.

And iTunes too

So, to avoid Copyrights issues and all kind of related stuff I suggest to follow their guidelines.