Referencing Styles : Harvard . The basic elements of the circular economy model – see here for a simple overview with easy to understand definitions: https://www.ellenmacarthurfoundation.org/circular-economy/interactive-diagram 2. How different ‘schools of thought’ have contirubted to the key principles of the model – see here for a short and simple overview: https://www.ellenmacarthurfoundation.org/circular-economy/schools-of-thought/cradle2cradle . The basic elements of the circular economy model – see here for a simple overview with easy to understand definitions: https://www.ellenmacarthurfoundation.org/circular-economy/interactive-diagram 2. How different ‘schools of thought’ have contirubted to the key principles of the model – see here for a short and simple overview: https://www.ellenmacarthurfoundation.org/circular-economy/schools-of-thought/cradle2cradle Read Less