APA
Hufschmidt M. e. a., . (1990). Environmental, Natural Systems & Development: An Economic Va. : The John Hopkins University Press.
Chicago
Hufschmidt MM et al, . 1990. Environmental, Natural Systems & Development: An Economic Va. : The John Hopkins University Press.
Harvard
Hufschmidt M. e. a., . (1990). Environmental, Natural Systems & Development: An Economic Va. : The John Hopkins University Press.
MLA
Hufschmidt MM et al, . Environmental, Natural Systems & Development: An Economic Va. : The John Hopkins University Press. 1990.