Jelaskan Rujukan dari Batu api dalam bahasa melayu

Flint Architecture of East Anglia Book by Stephen Hart

Flintsource.net European Artefacts – detailed site

Flint circles and paramoudra – Beeston Bump

Paramoudras and flint circles photograph collection

Flint and the Conservation of Flint Buildings Introduction to the historical use of flint in construction and the repair and conservation of historic flint buildings