MLA

Claussen, Ron, et al. Updates From Market Researchers. USA, 2011.

APA

Claussen, R., Blades, C., Oulton, M., & Seiter, M. (2011). Updates from market researchers. USA.

Chicago

Claussen, Ron, Curt Blades, Mark Oulton, and Michael Seiter. Updates From Market Researchers. USA, 2011.