Dyer, W. G. (1972). Modern theory and method in group training. Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)Dyer, William G. Modern Theory and Method in Group Training. New York: Van Nostrand Reinhold, 1972.
Lua MLA (9ú heag.)Dyer, William G. Modern Theory and Method in Group Training. Van Nostrand Reinhold, 1972.
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