H. H. Rogers as Jekyll & Hyde — Illustrations from The World, 1906.
Mark Twain and Henry Huttleston Rogers – by Earl J. Dias
H. H. Rogers – Elbert Hubbard’s Little Journeys to the Homes of Great Business Men at Google Books
Henry Huttleston Rogers (1840 – 1909) — An evaluation on the 150th Anniversary of his Birth by Earl J. Dias
Frenzied Finance by Thomas Lawson from Dictionary of American Biography: