Burnell, I. The power of positive doing. International Personal Development, Goodwill Publishing House.
Chicago-referens (17:e uppl.)Burnell, Ivan. The Power of Positive Doing. Center Ossipee, NH : New Delhi: International Personal Development, Goodwill Publishing House.
MLA-referens (8:e uppl.)Burnell, Ivan. The Power of Positive Doing. International Personal Development, Goodwill Publishing House.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.