APA (7e ed.) Bronvermelding

STEINMETZ LAWRENCE L. (2006). HOW TO SELL AT MARGINS HIGHER THAN YOUR COMPETITORS. JOHN WILEY & SONS.

Chicago (17e ed.) Bronvermelding

STEINMETZ LAWRENCE L. HOW TO SELL AT MARGINS HIGHER THAN YOUR COMPETITORS. NEW JERSEY: JOHN WILEY & SONS, 2006.

MLA (9e ed.) Bronvermelding

STEINMETZ LAWRENCE L. HOW TO SELL AT MARGINS HIGHER THAN YOUR COMPETITORS. JOHN WILEY & SONS, 2006.