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.
Chicago-referens (17:e uppl.)Bagtas, Jonathan Esguerra, och 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.
MLA-referens (9:e uppl.)Bagtas, Jonathan Esguerra, och 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.