APA (7th ed.) Citation
Johnstone, P. (1978). Operation world: A day-to-day guide to praying for the world (4th ed.). STL.
Chicago Style (17th ed.) Citation
Johnstone, Patrick. Operation World: A Day-to-day Guide to Praying for the World. 4th ed. Kent, England: STL, 1978.
MLA (9th ed.) Citation
Johnstone, Patrick. Operation World: A Day-to-day Guide to Praying for the World. 4th ed. STL, 1978.
Warning: These citations may not always be 100% accurate.