1. T. Czachla, M. Jastrzębska, K. Kwiatkowska-Sienkiewicz, M. Rutkowska “The Influence of Different Factors on Quality of Coffee" Proceedings of the 16th International Congress of Nutrition” PT 395.
2. T. Czachla, E. Kondratowicz-Pietrusza, K. Kwiatkowska-Sienkiewicz, M. Rutkowska “The Kinetic Approach to Quality Estimation of Coffee" Proceedings of the 8th National Scientific Conference with International Participation. Subject: Quality of Goods, Varna, Bulgar 1998.
3. T. Czachla. K. Kwiatkowska-Sienkiewicz “Some Problems of Adulteriation of Ground Coffee" Proceedings of the 8th National Scientific Conference with International Participation. Subject: Quality of Goods, Varna, Bulgar 1998.
4. S. Karczmarczyk „Badania marketingowe - metody i techniki" PWE Warszawa 1996.