1. Agrawal, A., Amend, M., Das, M., Ford, M., Keller, C., Kloppmann, M., et al. (2007). WS-BPEL extension for people (BPEL4People), Version 1.0.
2. A pattern language: Towns, buildings, construction;Alexander,1977
3. Amend, M., Das, M., Ford, M., Keller, C., Kloppmann, M., Konig, D., et al. (2007). Web services human task. Version 1.0.
4. A collection of history patterns;Anderson,2000
5. Service interaction patterns;Barros,2005