John F. Parker: The Guard Who Abandoned His Post at the Abraham Lincoln's Assassination website Dr. George Brainerd Todd (April 14, 1865).
2011년 5월 28일에 확인함.  John F. Parker: The Guard Who Abandoned His Post at the Abraham Lincoln's Assassination website Dr. George Brainerd Todd (1865년 4월 14일 (& April 24, 1865)).