APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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