^Olson, Kenneth S.; Reiman, D. William; Sabio, Fernando; da Silva, Filipe Alberto (2013). “The voiced linguolabial plosive in Kajoko” (英語). Journal of West African Languages42 (2): 68. http://main.journalofwestafricanlanguages.org/index.php/downloads/download/117-volume-40-number-2/606-the-voiced-linguolabial-plosive-in-kajoko.