APA Style
Samuelson, Paul A, Nordhaus, William D, Sumaryati, Margaretha, Gretta. ().
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Chicago Style
Samuelson, Paul A, Nordhaus, William D, Sumaryati, Margaretha, Gretta.
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MLA Style
Samuelson, Paul A, Nordhaus, William D, Sumaryati, Margaretha, Gretta.
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Turabian Style
Samuelson, Paul A, Nordhaus, William D, Sumaryati, Margaretha, Gretta.
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