United Nations Environment Programme. Division of Early Warning and Assessment, Eamer, J., Ahlenius, H., & Prestrud, P. (2007). Global outlook for ice & snow. Division of Early Warning and Assessment (DEWA), United Nations Environmental Programme.
Cita Chicago Style (17a ed.)United Nations Environment Programme. Division of Early Warning and Assessment, Joan Eamer, Hugo Ahlenius, y Pål Prestrud. Global Outlook for Ice & Snow. Nairobi, Kenya: Division of Early Warning and Assessment (DEWA), United Nations Environmental Programme, 2007.
Cita MLA (8a ed.)United Nations Environment Programme. Division of Early Warning and Assessment, et al. Global Outlook for Ice & Snow. Division of Early Warning and Assessment (DEWA), United Nations Environmental Programme, 2007.