1. The geographical distribution of the shell-purple industry;Jackson,1917
2. Pliny the Elder. How wools are dyed with the juices of the purple. In: Historia Naturalis (The Natural History); 1st century AD, book 9, chapter 62.
3. Tyrian purple dyeing: an experimental approach with fresh Murex trunculus;Kanold,2011
4. The history of purple as a status symbol in antiquity;Reinhold;Collect Latomus,1970
5. Notes on the purple of the ancients. 3. Purple dyeing in modern times;Schunck;J Chem Soc,1880