APA

Sarppo D., Association for Computing Machinery, ACM Special Interest Group on Artificial Intelligence & ACM Special Interest Group on Electronic Commerce. (2007). Proceedings of the ninth international conference on Electronic commerce. New York, NY: ACM.

Chicago

Sarppo Donna, Association for Computing Machinery, ACM Special Interest Group on Artificial Intelligence and ACM Special Interest Group on Electronic Commerce. 2007. Proceedings of the ninth international conference on Electronic commerce. New York, NY: ACM.

Harvard

Sarppo D., Association for Computing Machinery, ACM Special Interest Group on Artificial Intelligence and ACM Special Interest Group on Electronic Commerce. (2007). Proceedings of the ninth international conference on Electronic commerce. New York, NY: ACM.

MLA

Sarppo Donna, Association for Computing Machinery, ACM Special Interest Group on Artificial Intelligence and ACM Special Interest Group on Electronic Commerce. Proceedings of the ninth international conference on Electronic commerce. New York, NY: ACM. 2007.