APA-viite (7. p.)
Johnstone, P. (1978). Operation world: A day-to-day guide to praying for the world (4th ed.). STL.
Chicago-viite (17. p.)
Johnstone, Patrick. Operation World: A Day-to-day Guide to Praying for the World. 4th ed. Kent, England: STL, 1978.
MLA-viite (9. p.)
Johnstone, Patrick. Operation World: A Day-to-day Guide to Praying for the World. 4th ed. STL, 1978.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.