Lua APA (7ú heag.)

BECKERMAN WILFRED. (1993). INTRODUCTION TO NATIONAL INCOME ANALYSIS (3.). UNIVERSAL BOOKS.

Lua i Stíl Chicago (17ú heag.)

BECKERMAN WILFRED. INTRODUCTION TO NATIONAL INCOME ANALYSIS. 3. NEW DELHI: UNIVERSAL BOOKS, 1993.

Lua MLA (9ú heag.)

BECKERMAN WILFRED. INTRODUCTION TO NATIONAL INCOME ANALYSIS. 3. UNIVERSAL BOOKS, 1993.

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