I cannot find the datasheet for Catalex MicroSD Card Adapter - Storage - Arduino Forum
Catalex MicroSD Card Reader Issues - Storage - Arduino Forum
Micro SD Card Tutorial : 6 Steps - Instructables
Amazon.com: Stemedu 5PCS Micro S D Card Reader Module Memory Storage Mini TF Card Adapter SPI Interface Breakout Modules for Arduino Raspberry Pi with 40P Dupont Cable : Electronics
Micro SD TF Memory Card Reader Module with SPI Interface For Arduino – Envistia Mall
Random Stuff: Interfacing a Serial SD Card Logger with RaspberryPi.