Tolba, M. K., Lamb, R., & Allen, P. (1983). Earth matters: Environmental challenges for the l980s. United Nations Environment Programme.
Citazione stile Chigago Style (17a edizione)Tolba, Mostafa Kamal, Robert Lamb, e Patrick Allen. Earth Matters: Environmental Challenges for the L980s. Nairobi, Kenya: United Nations Environment Programme, 1983.
Citatione MLA (9a ed.)Tolba, Mostafa Kamal, et al. Earth Matters: Environmental Challenges for the L980s. United Nations Environment Programme, 1983.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.