Beck T, Brandão M, Civit B, de Baan L, Goedkoop M, Koellner T, Margni M, Milà i Canals L, Müller-Wenk R, Weidema B P, Wittstock B (2012). Principles for life cycle inventories of land use on a global scale. International Journal of Life Cycle Assessment 18 (6):1203-1215 https://2-0-lca.com/?p=17817
Andrews E S, Barthel L-P, Beck T, Benoit C, Ciroth A, Cucuzzella C, Gensch C-O, Hubert J, Lesage P, Manhart A, Maria L, Mazeau P, Mazijn B, Methot A-L, Moberg A, Norris G A, Parent J, Prakash S, Reveret J-P, Spillemaeckers S, Ugaya S, Valdivia S, Weidema B P (2009). Guidelines for social life cycle assessment of products. United Nations Environment Programme. https://2-0-lca.com/?p=17790