Why don't they link to the physical book?
How would one link to a physical object?
If this is what you’re asking: there are (perhaps too discreet) links at the bottom of each page to Amazon and MIT Press to purchase the physical book.
They do, on the main site: https://www.pbrt.org
Physically Based Reading
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How would one link to a physical object?
If this is what you’re asking: there are (perhaps too discreet) links at the bottom of each page to Amazon and MIT Press to purchase the physical book.