How to install an SSD on a 15-inch Retina MacBook Pro
MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide
Amazon.com: Odyson - 768GB SSD Replacement for MacBook Pro 13" A1425 & 15" A1398 (2012, Early 2013) : Electronics
How-To: Upgrade the SSD in your MacBook Air or Retina MacBook Pro, boosting size & speed - 9to5Mac
Amazon.com: MCE Technologies 1TB Internal SSD Flash Upgrade for MacBook Pro Retina (Mid 2012 - Early 2013) - Includes USB 3.0 Enclosure for Original Drive & Install Kit! : Electronics
MacBook Pro (Retina, 13-inch, Early 2015) Upgrade to NVMe M.2 SSD - YouTube
M.2 NGFF Adapter for 2012 & Early 2013 MacBook Pro Retina SSD Replacement | eBay
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
Upgrading SSD on Macbook Pro Late 2013 - Ask Different