APA (7e ed.) Bronvermelding

HELLER ROBERT. (1992). BUSINESS OF WINNING: HOW TO SUCCEED IN BUSINESS BY REALLY TRYING. RUPA & COMPANY.

Chicago (17e ed.) Bronvermelding

HELLER ROBERT. BUSINESS OF WINNING: HOW TO SUCCEED IN BUSINESS BY REALLY TRYING. MUMBAI: RUPA & COMPANY, 1992.

MLA (9e ed.) Bronvermelding

HELLER ROBERT. BUSINESS OF WINNING: HOW TO SUCCEED IN BUSINESS BY REALLY TRYING. RUPA & COMPANY, 1992.