29 April – Saint Hugh of Cluny

Modern Hagiography

Roman Martyrology

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Pictorial Lives of the Saints 

Pictorial Half Hours with the Saints by Auguste François Lecanu.

Medieval Hagiography

BHL, Supplement

Acta Sanctorum

Writings by Saint Hugh

Documenta Catholica Omnia

Art & Architecture

Index of Medieval Art

Portail Biblissima

POP : la plateforme ouverte du patrimoine

Chapel of the Château des Moines, Berzé-la-Ville

Post-Biblical Saints Art Index

2697 & 2698 – actually Saint Hugh of Grenoble, 1 April, 2698 – not identified as Saint Hugo in the online database of the Houston Museum of Fine Arts

The Saints in Art by Joseph Maria von Radowitz.