Both OS X 10.9 and OS X 10.8

I just bought an iMAC and I currently have OS X 10.9 Maveriks.
Question:
By using Disk Utility, can I create a second partion on my disk drive and install a new version of OS X 10.8 Mountain Lion, so I can have and use both of the Operating System, 10.9 and 10.8?
The reason why I want to do this, because I am new to MAC, and currently I am reading a book: Apple OS X Essential Training. The book is based on OS X 10.8 Mountain Lion and I would like to study first Mountain Lion in order to understand better Maveriks.
Thank you

But, you can virtualize Mountain Lion, using VMware Fusion or Parallels Desktop

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TigerMom28 wrote:
I've run out of room on my hard drive. I bought an external drive and exported all my albums to the external drive then deleted the albums from iPhoto.
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Both OS X 10.9 and OS X 10.8

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