APA-viite (7. p.)
Johnstone, P. (1978). Operation world: A day to day guide to praying for the world. WEC Publications.
Chicago-viite (17. p.)
Johnstone, Patrick. Operation World: A Day to Day Guide to Praying for the World. England: WEC Publications, 1978.
MLA-viite (9. p.)
Johnstone, Patrick. Operation World: A Day to Day Guide to Praying for the World. WEC Publications, 1978.
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