Bagtas, J. E., & Dyoco, R. N. (1999). The farmers of San Simon before and after the temporary closure of ugnayang magsasaka ng San Simon inc: A socio-economic analysis. University of the Philippines Diliman Extension Program in Pampanga.
Lua i Stíl Chicago (17ú heag.)Bagtas, Jonathan Esguerra, agus Romeo N. Dyoco. The Farmers of San Simon Before and After the Temporary Closure of Ugnayang Magsasaka Ng San Simon Inc: A Socio-economic Analysis. Pampanga: University of the Philippines Diliman Extension Program in Pampanga, 1999.
Lua MLA (9ú heag.)Bagtas, Jonathan Esguerra, agus Romeo N. Dyoco. The Farmers of San Simon Before and After the Temporary Closure of Ugnayang Magsasaka Ng San Simon Inc: A Socio-economic Analysis. University of the Philippines Diliman Extension Program in Pampanga, 1999.