Gaya APA
Gramilich, E, M. (1990).
A guide to beneft - cost analysis (2nd.ed.).
Englewood Cliffs, New Jersey:
Prentice-Hall.
Gaya MLA
Gramilich, Edward, M..
"A guide to beneft - cost analysis".
2nd.ed.
Englewood Cliffs, New Jersey:
Prentice-Hall,
1990.
Text.