Gaya APA
Ruggles, R., D.Ruggles, N. (1956).
National Income Accounts And Income Analysis (Ed.2).
New York:
McGraw-Hill.
Gaya MLA
Ruggles, Richard., D.Ruggles, Nancy.
"National Income Accounts And Income Analysis".
Ed.2
New York:
McGraw-Hill,
1956.
Buku FE.