Umbriel---another Minimal Programming LanguageTerry · Association for Computing Machinery (ACM)1995PDF443 KB
Umbriel---imperative Programming for Unsophisticated StudentsTerry · ACM SIGCSE Bulletin1995PDF621 KB
Narrow-band spectrophotometry of Ariel, Umbriel, Titania, Oberon, and TritonJohnson · Icarus1978PDF342 KB
