LeTourneau, R. (1975). Keeping your cool in a world of tension. Zondervan.
Lua i Stíl Chicago (17ú heag.)LeTourneau, Richard. Keeping Your Cool in a World of Tension. Michigan: Zondervan, 1975.
Lua MLA (9ú heag.)LeTourneau, Richard. Keeping Your Cool in a World of Tension. Zondervan, 1975.
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