MacBook Pro 13" Retina Display Early 2015 Teardown - iFixit
Can we upgrade the memory (RAM) of the Macbook Air early 2015 model? - Quora
MacBook Pro (Retina, 13-inch, Early 2015) Upgrade to NVMe M.2 SSD - YouTube
Amazon.com: 3.1 GHz Core i7 (I7-5557U) 8GB RAM Logic Board 820-4924-A for Apple MacBook Pro Retina 13" A1502 2015-90 Days Warranty : Electronics
MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide
Apple MacBook Pro: RAM upgrade (HowTo)
Apple MacBook Pro with Retina Display (15-inch, 2014) review: Still the best higher-res laptop, but the competition is catching up - CNET
Install 16GB RAM Upgrade on Macbook Pro 15" in under 5 minutes - YouTube
Restored Apple Macbook Pro 13.3-inch (Retina) 2.7Ghz Dual Core i5 (Early 2015) MF839LL/A 128GB SSD 8 GB Memory 2560x1600 Display Mac OS X v10.12 Sierra Power Adapter Included (Refurbished) - Walmart.com