- "JOHNSTON, Henry Phelps". Who's Who in New York City and State, 4: p. 748. 1909.
- http://harpers.org/subjects/HenryPhelpsJohnston articles by H. P. Johnston published in Harper's Magazine
- http://drs.library.yale.edu:8083/fedora/get/mssa:ms.1400/PDF guide to the papers of H. P. Johnston at Yale
- http://gutenberg.org/ebooks/21990 The Campaigns of 1776 around New York and Brooklyn by H. P. Johnston