http://elasticsheep.com/2010/01/reading-an-sd-card-with-an-atmega168/

@misc{sdcard_pinout,
  title = {SDCard pinout},
  howpublished = {\url{http://elasticsheep.com/2010/01/reading-an-sd-card-with-an-atmega168/}},
  note = {Accessed: 2015-04-16}
}