Philippine Rice Research Institute & Catudan, B. M. (2013). Philippine rice industry primer series: Region I: Ilocos. Philippine Rice Research Institute.
Lua i Stíl Chicago (17ú heag.)Philippine Rice Research Institute agus Bethzaida M. Catudan. Philippine Rice Industry Primer Series: Region I: Ilocos. Nueva Ecija: Philippine Rice Research Institute, 2013.
Lua MLA (9ú heag.)Philippine Rice Research Institute agus Bethzaida M. Catudan. Philippine Rice Industry Primer Series: Region I: Ilocos. Philippine Rice Research Institute, 2013.
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