VIGLIA, Silvio, FRANZESE, Pier Paolo, ZUCARO, Amalia, BLACKSTOCK, Kirsty L., MATTHEWS, Keith B. and ULGIATI, Sergio. Resource use and biophysical constraints of Scottish agriculture. Ecological Questions. Online. 30 October 2013. Vol. 15, no. 1, p. 57–69. [Accessed 3 July 2025]. DOI 10.12775/v10090-011-0036-1.