Haarmann, Harald. Ethnicity and Language in the Ancient Mediterranean. McInerney, Jeremy (编). A Companion to Ethnicity in the Ancient Mediterranean. Chichester, UK: John Wiley & Sons, Inc. 20142014. ISBN 9781444337341. doi:10.1002/9781118834312.ch2(英语).:17-33
Aikio, Ante. An essay on substrate studies and the origin of Saami. Hyvärinen, Irma; Kallio, Petri; Korhonen, Jarmo (编). Etymologie, Entlehnungen und Entwicklungen [Etymology, loanwords and developments]. Mémoires de la Société Néophilologique de Helsinki 63. Helsinki: Société Néophilologique. 2004 [2021-08-24]. ISBN 978-951-9040-19-6. (原始内容存档于2022-05-24) (德语).:5–34
Häkkinen, Jaakko. Early contacts between Uralic and Yukaghir(PDF). Suomalais-Ugrilaisen Seuran Toimituksia − Mémoires de la Société Finno-Ougrienne (Helsinki: Finno-Ugric Society). 2012, (264) [13 July 2013]. (原始内容(PDF)存档于2019-08-31).:91–101
Haarmann, Harald. Pre-Indo-European Writing in Old Europe as a Challenge to the IndoEuropean Intruders. Indogermanische Forschungen. 1-8 96. Strasbourg: Walter De Gruyter. 19911991 (英语).:1-8