Otis, G., & Brockman, M. (1995). Strongholds of the 10/40 window: Intercessor's guide to the world's least evangelized nations. YWAM Publications.
Citace podle Chicago (17th ed.)Otis, George, a Mark Brockman. Strongholds of the 10/40 Window: Intercessor's Guide to the World's Least Evangelized Nations. Seattle: YWAM Publications, 1995.
Citace podle MLA (9th ed.)Otis, George, a Mark Brockman. Strongholds of the 10/40 Window: Intercessor's Guide to the World's Least Evangelized Nations. YWAM Publications, 1995.
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