Dyfyniad APA

CALLAN, S. J., & THOMAS, J. M. (1996). Environmental economics and management: Theory, policyand applications. Irwin.

Dyfyniad Arddull Chicago

CALLAN, Scott J., and Janet M. THOMAS. Environmental Economics and Management: Theory, Policyand Applications. Chicago: Irwin, 1996.

Dyfyniad MLA

CALLAN, Scott J., and Janet M. THOMAS. Environmental Economics and Management: Theory, Policyand Applications. Irwin, 1996.

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