APA (7e ed.) Bronvermelding

NOBBS J. (1994). ECONOMICS A CORE TEXT. MC GRAW HILL.

Chicago (17e ed.) Bronvermelding

NOBBS J. ECONOMICS A CORE TEXT. NEW YORK: MC GRAW HILL, 1994.

MLA (9e ed.) Bronvermelding

NOBBS J. ECONOMICS A CORE TEXT. MC GRAW HILL, 1994.