APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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