Dalgado, Sebastião Rodolfo (1936). Portuguese Vocables in Asiatic Languages. Diterjemahkan oleh Xavier Soares, Anthony (ed. bahasa Inggeris). Baroda: Oriental Institute. m/s. 352.
books.google.com
James D. Mauseth (2014). Botany. Jones & Bartlett Publishers. m/s. 223. ISBN978-1-4496-4884-8. Perhaps the simplest of fruits are those of grasses (all cereals such as corn and wheat)...These fruits are caryopses.
dbp.gov.my
prpm.dbp.gov.my
"terigu". Kamus Dewan (ed. keempat). Kuala Lumpur: Dewan Bahasa dan Pustaka Malaysia. Dicapai pada 28 Mac 2020 – melalui Pusat Rujukan Persuratan Melayu.