著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Asmar, Samir and Nikahetiya, S. B. R. and Yapa, L. G.","A study of agricultural extension, training, and communication in Colombo District, with special reference to six selected villages in the class II coconut area",,Agrarian Research and Training Institute,1975,Research study series,,,,https://cir.nii.ac.jp/crid/1130000797497024000