Gaya APA
case, K, E., fair, R, C.
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Principles of ecnomics ed. 8
(
8)
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New Jersey:
Pearson Prentice hall.
Gaya MLA
case, Karl, E., fair, Ray, C.
"Principles of ecnomics ed. 8".
8
New Jersey:
Pearson Prentice hall,
2007.
Text.