Chartres made new use of Gothic flying butresses & vaulting.
What Is Gothic Architecture, According to Design Experts
Chartres Cathedral, Paris – Architecture Revived
Robin Lhebrard - Gothic Architecture
Gothic Cathedrals: Architecture & Divine Light - World History
Why do some Gothic buildings have two different towers? - Quora
The Spiritual Imagination: Why what we do with our buildings
Chartres Cathedral - World History Encyclopedia
Chartres Cathedral, Paris – Architecture Revived
Exploring Architectural Styles: A Journey Through Time and Design
Gothic architecture
Notre Dame of Chartres, Exterior – Saint Louis Patina®