APA
International Institute for Environment and Development, World Resources Institute, . (1987). World resources 1987. New York: Basic Books Inc.
Chicago
International Institute for Environment and Development, World Resources Institute, . 1987. World resources 1987. New York: Basic Books Inc.
Harvard
International Institute for Environment and Development, World Resources Institute, . (1987). World resources 1987. New York: Basic Books Inc.
MLA
International Institute for Environment and Development, World Resources Institute, . World resources 1987. New York: Basic Books Inc. 1987.