Thompson, W. O. (1981). Concentric circles of concern. Broadman.
Lua i Stíl Chicago (17ú heag.)Thompson, W. Oscar. Concentric Circles of Concern. Nashville: Broadman, 1981.
Lua MLA (9ú heag.)Thompson, W. Oscar. Concentric Circles of Concern. Broadman, 1981.
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