Singh P N. (2004). Self Development for Sure Success. Bishwanath Singh Trust.
Chicago-referens (17:e uppl.)Singh P N. Self Development for Sure Success. Mumbai: Bishwanath Singh Trust, 2004.
MLA-referens (9:e uppl.)Singh P N. Self Development for Sure Success. Bishwanath Singh Trust, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.