Παραπομπή σε μορφή APA (7η εκδ.)

International Network in Environmental Education & Ζιάκα, Γ. (2000). Environmental education for the 21st century: Issues and perspectives for a permanent forum. Polis - International Network in Environmental Education.

Παραπομπή σε μορφή Chicago (17η εκδ.)

International Network in Environmental Education και Γιολάντα Ζιάκα. Environmental Education for the 21st Century: Issues and Perspectives for a Permanent Forum. Ermoupolis, Syros: Polis - International Network in Environmental Education, 2000.

Παραπομπή σε μορφή MLA (9th εκδ.)

International Network in Environmental Education και Γιολάντα Ζιάκα. Environmental Education for the 21st Century: Issues and Perspectives for a Permanent Forum. Polis - International Network in Environmental Education, 2000.