Gaya APA

RUGGLES, R., RUGGLES, N, D. (1956). NATIONAL INCOME ACCOUNTS AND INCOME ANALYSIS (2). London: McGRAW-HILL.

Gaya MLA

RUGGLES, Richard., RUGGLES, Nancy, D.. "NATIONAL INCOME ACCOUNTS AND INCOME ANALYSIS". 2 London: McGRAW-HILL, 1956. Textbook.