APA (7th ed.) Citation
Otis, G., & Brockman, M. (1995). Strongholds of the 10/40 window: Intercessor's guide to the world's least evangelized nations. YWAM Publications.
Chicago Style (17th ed.) Citation
Otis, George, and Mark Brockman. Strongholds of the 10/40 Window: Intercessor's Guide to the World's Least Evangelized Nations. Seattle: YWAM Publications, 1995.
MLA (9th ed.) Citation
Otis, George, and Mark Brockman. Strongholds of the 10/40 Window: Intercessor's Guide to the World's Least Evangelized Nations. YWAM Publications, 1995.
Warning: These citations may not always be 100% accurate.