Arias, P. R. (1997). Why upland farmers adopt conservation measures. Manila Bulletin.
Citación estilo ChicagoArias, Priscila R. "Why Upland Farmers Adopt Conservation Measures." Manila Bulletin 1997.
Cita MLAArias, Priscila R. "Why Upland Farmers Adopt Conservation Measures." Manila Bulletin, 1997.
Warning: These citations may not always be 100% accurate.