Olson et al. (2010:206), citing MacGregor (1995:365) Olson, Kenneth; Mielke, Jeff; Sanicas-Daguman, Josephine; Pebley, Carol Jean; Paterson, Hugh J. III (2010), "The phonetic status of the (inter)dental approximant", Journal of the International Phonetic Association, 40 (2): 199–215, doi:10.1017/S0025100309990296 MacGregor, Louise A. (1995), "Kagayanen: Introduction and wordlist", in Tryon, Darrell T. (ed.), Comparative Austronesian dictionary: An introduction to Austronesian studies, part 1: fascicle 1, Trends in Linguistics., vol. 10, Berlin: Mouton de Gruyter, pp. 363–368
Olson & Mielke (2007) Olson, Kenneth S.; Mielke, Jeff (2007), "Acoustic properties of the Kagayanen vowel space"(PDF), in Trouvain, Jürgen; Barry, William (eds.), Proceedings of the 16th International Congress of Phonetic Sciences, Universität des Saarlandes, pp. 845–848, retrieved 2009-03-15
Olson & Mielke (2007:845) Olson, Kenneth S.; Mielke, Jeff (2007), "Acoustic properties of the Kagayanen vowel space"(PDF), in Trouvain, Jürgen; Barry, William (eds.), Proceedings of the 16th International Congress of Phonetic Sciences, Universität des Saarlandes, pp. 845–848, retrieved 2009-03-15
Olson & Mielke (2007:847) Olson, Kenneth S.; Mielke, Jeff (2007), "Acoustic properties of the Kagayanen vowel space"(PDF), in Trouvain, Jürgen; Barry, William (eds.), Proceedings of the 16th International Congress of Phonetic Sciences, Universität des Saarlandes, pp. 845–848, retrieved 2009-03-15
Olson et al. (2010:206), citing MacGregor (1995:365) Olson, Kenneth; Mielke, Jeff; Sanicas-Daguman, Josephine; Pebley, Carol Jean; Paterson, Hugh J. III (2010), "The phonetic status of the (inter)dental approximant", Journal of the International Phonetic Association, 40 (2): 199–215, doi:10.1017/S0025100309990296 MacGregor, Louise A. (1995), "Kagayanen: Introduction and wordlist", in Tryon, Darrell T. (ed.), Comparative Austronesian dictionary: An introduction to Austronesian studies, part 1: fascicle 1, Trends in Linguistics., vol. 10, Berlin: Mouton de Gruyter, pp. 363–368