Singh P N. (2004). Self Development for Sure Success. Bishwanath Singh Trust.
Chicago-viite (17. p.)Singh P N. Self Development for Sure Success. Mumbai: Bishwanath Singh Trust, 2004.
MLA-viite (9. p.)Singh P N. Self Development for Sure Success. Bishwanath Singh Trust, 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.