APA (7e ed.) Bronvermelding

DE BONO EDWARD. (1978). OPPORTUNITIES: A HANDBOOK OF BUSINESS APPORTUNITY SEARCH. PENGUIN BOOKS INDIA (P) LTD.

Chicago (17e ed.) Bronvermelding

DE BONO EDWARD. OPPORTUNITIES: A HANDBOOK OF BUSINESS APPORTUNITY SEARCH. ENGLAND: PENGUIN BOOKS INDIA (P) LTD, 1978.

MLA (9e ed.) Bronvermelding

DE BONO EDWARD. OPPORTUNITIES: A HANDBOOK OF BUSINESS APPORTUNITY SEARCH. PENGUIN BOOKS INDIA (P) LTD, 1978.