Dyfyniad APA

Heimlich, J. E. (2002). Environmental education: A resource handbook. Phi Delta Kappa EducationalFoundation.

Dyfyniad Arddull Chicago

Heimlich, Joe E. Environmental Education: A Resource Handbook. Estados Unidos: Phi Delta Kappa EducationalFoundation, 2002.

Dyfyniad MLA

Heimlich, Joe E. Environmental Education: A Resource Handbook. Phi Delta Kappa EducationalFoundation, 2002.

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