Install OS X 10.8 on external drive - Main System on OS X 10.9

Hi guys,
I was trying to install on an external drive, but I'm facing some problems.
My mac is a MBPr Early 2013 and has been shipped with OS X 10.8.X. I upgraded to OS X 10.9 a while ago.
For software testing, I need a system running 10.8 (on an external hard drive).
I couldn't find the 10.8 installer on my App Store account.
How do I install 10.8 on the USB drive?
Thank you.
Cheers

Interesting did you look under Purchases while logged in to the MAS with the same Apple ID you used before"
My purchases tab shows all OS's since Lion
And would let me Install it if I choose to.

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