Villegas, L. M. (1966). Field demonstration: Its effects on level of knowledge, understanding and attitudes of farmers about choice of a rice variety and use of fertilizers.
Chicago-viite (17. p.)Villegas, Leopoldo M. Field Demonstration: Its Effects on Level of Knowledge, Understanding and Attitudes of Farmers About Choice of a Rice Variety and Use of Fertilizers. 1966.
MLA-viite (9. p.)Villegas, Leopoldo M. Field Demonstration: Its Effects on Level of Knowledge, Understanding and Attitudes of Farmers About Choice of a Rice Variety and Use of Fertilizers. 1966.
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