MLA

Just, R. E, and James C Hanson. The Potential for Transition to Paid Extension: Some Guiding Economic Principles. USA, 2001.

APA

Just, R. E, & Hanson, J. C. (2001). The potential for transition to paid extension: some guiding economic principles. USA.

Chicago

Just, R. E., and James C Hanson. The Potential for Transition to Paid Extension: Some Guiding Economic Principles. USA, 2001.