Gaya APA

Krutilla, J, V., Smith, V, K. (1988). Environmental Resources and Applied Welfave Economics . Washingon DC: Resouces for the future.

Gaya MLA

Krutilla, John, V.., Smith, V., Kerry. "Environmental Resources and Applied Welfave Economics". Washingon DC: Resouces for the future, 1988. Text.