1. Royal Purple dye: tracing the chemical origins of the industry;McGovern;Anal. Chem.,1985
2. The Geographical Distribution of the Shell-Purple Industry;Jackson,1917
3. Historia Naturalis,1929
4. Purple Fish;Cole;Phil. Trans. Roy. Soc.,1685
5. The history of purple as a status symbol in antiquity;Reinhold;Collect. Latomus.,1970