Understanding SD, SDIO and MMC Interface - FuzzyWare
SD vs. SDHC Memory Cards - - YouTube
Common Memory Card Types: SD, TF, CF, MMC, MS, xD, and XQD - MiniTool Partition Wizard
Amazon.com: SD Card Reader 7 in 1 USB3.0 Multi Card Reader for SD/Micro SD /CF/XD/MS/MMC Camera Memory Card, 5Gbps High Speed Sony Memory Stick Reader Adapter Read 5 Cards Simultaneously : Electronics
StarTech.com USB 3.0 External Flash Multi Media Memory Card (FCREADMICRO3)
USB 3.0 Card Reader, TSV TF Card/SD Memory Reader Adapter Supports SD/Micro SD/SDHC/SDXC/MMC, Mini Camera Flash Reader Compatible with Windows, Mac, Linux - Walmart.com
What Is MMC Card and The Difference between MMC and SD Card