Gaya APA
Hartwick, J, M., Olewiler, N, D. (1998).
The Economics of natural resource use (2nd ed).
Reading, MA:
Addison-Wesley.
Gaya MLA
Hartwick, John, M.., Olewiler, Nancy, D..
"The Economics of natural resource use".
2nd ed
Reading, MA:
Addison-Wesley,
1998.
Text.