Dyfyniad APA

Callan, S. J., & Thomas, J. M. (1996). Environmental economics and management: Through, policy and application. Irwin.

Dyfyniad Arddull Chicago

Callan, Scott J., and Janet M. Thomas. Environmental Economics and Management: Through, Policy and Application. Chicago: Irwin, 1996.

Dyfyniad MLA

Callan, Scott J., and Janet M. Thomas. Environmental Economics and Management: Through, Policy and Application. Irwin, 1996.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.