Dyfyniad APA

Speth, G. J. (2005). Global environmental challenges: Transitions to a sustainable world. Orient Longman.

Dyfyniad Arddull Chicago

Speth, Gustave James. Global Environmental Challenges: Transitions to a Sustainable World. Hyderabad: Orient Longman, 2005.

Dyfyniad MLA

Speth, Gustave James. Global Environmental Challenges: Transitions to a Sustainable World. Orient Longman, 2005.

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