1. The World Encyclopaedia of coffee;Banks,1999
2. Caffeine content in coffee as influenced by grinding and brewing techniques;Bell;Food Research International,1996
3. Coffee volume 2: Technology;Clarke,1987
4. Nitrogenous compounds;Macrae,1985
5. Clifford, M.N., Kazi. T. & Crawford S. (1987). The content and washout kinetics of chlorogenic acids in normal and abnormal green coffee beans, Douzième Colloque International sur la Chimie des Cafés Verts, Torréfiés et Leurs Dérivés (pp. 221–228) Montreux: Association Scientifique Internationale du Café.