John W Spaven. (1960). Campaigns in agricultural extension programs; N.3. Michigan: National Project in Agricultural Communication.
Styl ChicagoJohn W Spaven. Campaigns in Agricultural Extension Programs; N.3. Michigan: National Project in Agricultural Communication, 1960.
Citace podle MLAJohn W Spaven. Campaigns in Agricultural Extension Programs; N.3. Michigan: National Project in Agricultural Communication, 1960.
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