Gaya APA

Ostroumov, A, Y, D, S. (1991). Conservation Of Living Nature An Resources : Problems, Trends, And Prospeets . New York: Sprnger-Verlag New or.

Gaya MLA

Ostroumov, A.V., Yablokov, Dan, S.A.. "Conservation Of Living Nature An Resources : Problems, Trends, And Prospeets". New York: Sprnger-Verlag New or, 1991. Text.