1. Chapter 14A - Geomathematical and statistical procedures;Agterberg,2020
2. A soft body of evidence: a puzzle that has confused paleontologists for more than a century has finally been solved;Aldridge;Natural History,1989
3. British Silurian Stratigraphy;Aldridge,2000
4. Oxygen and carbon isotopic composition of Silurian brachiopods: implications for coeval seawater and glaciations;Azmy;Geological Society of America Bulletin,1998
5. Silurian strontium isotope stratigraphy;Azmy;Geological Society of America Bulletin,1999