Παραπομπή σε μορφή APA (7η εκδ.)

Bell, S. 1. J. 3., & Morse, S. (1999). Sustainability indicators: Measuring the immeasurable? Earthscan Publications.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Bell, Simon 1957 July 30-, και Stephen Morse. Sustainability Indicators: Measuring the Immeasurable? London: Earthscan Publications, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

Bell, Simon 1957 July 30-, και Stephen Morse. Sustainability Indicators: Measuring the Immeasurable? Earthscan Publications, 1999.