Tiit-Rein Viitso; Valts Ernštreits (2012–2013), “i’g”, inLīvõkīel-ēstikīel-lețkīel sõnārōntõz [Livonian-Estonian-Latvian Dictionary][1] (in Estonian and Latvian), Tartu, Rīga: Tartu Ülikool, Latviešu valodas aģentūra
J. Juanmarti,Diccionario moro-maguindanao-español (1892);A Grammar of the Maguindanao Tongue (1902), a translation into English by the US War Department
R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke,et al., editors (1950–present), “ig”, inGeiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies