Sibley, L. (1960). A comparison of leaders in small, average, and large Sunday schools: Survey of Sunday church school leaders, 1960. Lutheran Church in America.
Lua i Stíl Chicago (17ú heag.)Sibley, L. A Comparison of Leaders in Small, Average, and Large Sunday Schools: Survey of Sunday Church School Leaders, 1960. Philadelphia: Lutheran Church in America, 1960.
Lua MLA (8ú heag.)Sibley, L. A Comparison of Leaders in Small, Average, and Large Sunday Schools: Survey of Sunday Church School Leaders, 1960. Lutheran Church in America, 1960.
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