MLA

Walter, John, Gary Vorpahl, and Kyle Haley. Updates by Ag Communication Trade Association Leaders. USA, 2008.

APA

Walter, J., Vorpahl, G., & Haley, K. (2008). Updates by ag communication trade association leaders. USA.

Chicago

Walter, John, Gary Vorpahl, and Kyle Haley. Updates by Ag Communication Trade Association Leaders. USA, 2008.