- National Portrait Gallery: NPG x18530, portrait photo of Henry Holiday, 1870s
- National Portrait Gallery: NPG x22251, portrait photo of Henry Holiday’s father, 1870s
- Henry Holiday: «L.C. forgot that “the Snark” is a tragedy», 1876
- Henry Holiday: Reminiscences of my Life, c. 1914
- Henry Holiday: The Snark’s Significance, 1898
- Wikipedia: Henry Holiday
- Category Henry Holiday in snrk.de
2018-05-24, update: 2021-03-15