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Apple MacBook Pro (15-inch, 2013) review: Apple's high-end laptop gets better battery life and a lower price - CNET
A-Tech 8GB Kit (2x4GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube
Apple MacBook Pro Retina 15", Late 2013, Core i7 kaufen - Revendo
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Apple MacBook Pro with Retina Display (13-inch, 2013) review: Not a Retina MacBook Air, but awfully close - CNET
Review Apple MacBook Pro Retina 13 Late 2013 Notebook - NotebookCheck.net Reviews
MacBook Pro (Retina, 13-inch, Early 2013) - Technical Specifications
13" Apple MacBook Pro Retina 2.4GHz i5 8GB RAM 256GB SSD Late 2013 | eBay