http://www.jevuska.com/topic/pembangunan+pertanian+berkelanjutan+andalan+pembangunan+nasional1 .html

http://www.gorontalofamily.org/mirror/download/ produksi-pertanian .pdf

http://www.google.co.id/url?sa=t&source=web&cd=6&ved=0CDkQFjAF&url=http%3A%2F%2Fpse.litbang.deptan.go.id%2Find%2Fpdffiles% 2FSHP_NYK_2007 .pdf&ei=kpC1TbXiK4vLrQf30rm5BQ&usg=AFQjCNG7YJME6PrstMJy8_mIrCIL_Vg8 GQ