Robert Ingersoll Aitken on Wikipedia
External resources
- http://siris-artinventories.si.edu/ipac20/ipac.jsp?session=11425B0W479T3.14037&menu=search&aspect=power&npp=50&ipp=20&spp=20&profile=ariall&ri=2&source=%7E%21siartinventories&index=.AW&term=Aitken%2C+Robert&aspect=power#focus
- http://www.aaa.si.edu/collections/robert-ingersoll-aitken-papers-7157
- http://www.dcmemorials.com/index_indiv0000166.htm