MacCallum, Don. "Peripheral Nervous System". Histology and Virtual Microscopy Learning Resources. University of Michigan Medical School. Arkiveret fra originalen 7. juli 2014. Hentet 24. juni 2014.
MacCallum, Don. "Peripheral Nervous System". Histology and Virtual Microscopy Learning Resources. University of Michigan Medical School. Arkiveret fra originalen 7. juli 2014. Hentet 24. juni 2014.