1 Aikio, Ante (2004): “An essay on substrate studies and the origin of Saami”. In: Irma Hyvärinen, Petri Kallio, Jarmo Korhonen (eds.): Etymologie, Entlehnungen und Entwicklungen: Festschrift für Jorma Koivulehto zum 70. Geburtstag (Mémoires de la Société Néo-philologique de Helsinki 63). Helsinki: Publishing House of the Société Néophilologique de Helsinki. 5–34.

2 Altheim, Franz (1951): Geschichte der lateinischen Sprache von den Anfängen bis zum Beginn der Literatur. Frankfurt am Main: Vittorio Klosterman Verlag.

3 Beekes, Robert (2009): Etymological Dictionary of Greek. Leiden: Brill.

4 Beekes, Robert (2014): Pre-Greek: Phonology, Morphology, Lexicon. Leiden: Brill.

5 Brenzinger, Matthias (1992): “Lexical Retention in Language Shift”. In Matthias Brenzinger (ed.): Language Death: Factual and Theoretical Explorations. Berlin: de Gruyter. 213–254.

6 Corriente, Federico (2008): “Coptic loanwords of Egyptian Arabic in comparison with the parallel case of Romance loanwords in Andalusi Arabic”. Collectanea Christiana Orientalia 5. 59–123.

7 Grzega, Joachim (2001): Romania Gallica Cisalpina. Tübingen: Max Niemeyer.

8 Holes, Clive (2001): Dialect, Culture, and Society in Eastern Arabia: Glossary. Leiden: Brill.

9 Hopkins, S. (1995): “Sarar ‘pebbles’ – A Canaanite Substrate Word in Palestinian Arabic”. Zeitschrift für Arabische Linguistik 18. 37–49.

10 Hubschmid, Johannes (1982): “Vorindogermanische und Indogermanische Substratwörter in den Romanischen Sprachen”. In: Sture P. Ureland (ed).: Die Leistung der Strataforschung und der Kreolistik. Tübingen: Max Niemeyer.

11 Kossmann, Maarten (2013): The Arabic Influence on Northern Berbe. Leiden: Brill.

12 Lubotsky, Aleksandr (2001): “The Indo-Iranian Substratum”. In: Christian Carpelan, A. Parpola, P. Koskikallio (eds.): Early Contacts between Uralic and Indo-European: Linguistic and Archaeological Considerations. Helsinki: Suomalais- Ugrilainen Seura. 301–317.

13 Matasović, Ranko (2012): “The substratum in Insular Celtic”. Journal of Language Relationship 8. 153–168.

14 Polomé, Edgar (1992): “Germanic, North-West-Indo-European and Pre-Indo-European Substrates”. In Rosina Lippi-Green (ed.): Recent Developments in Germanic Linguistics. Amsterdam: John Benjamins.

15 Schmid, Wolfgang (1994): “Das Lateinische und die Alteuropa Theorie”. In: Wolfgang P. Schmid: Linguisticae Scientiae Collectanea. Berlin: De Gruyter. 316–334.

16 Schmidt, Uwe Friedrich (2008): Praeromanica der Italoromania auf der Grundlage des LEI (A und B). Frankfurt am Main: Peter Lang.

17 Schrijver, Petrus Cornelis Hendrikus (1997): “Substrate words”. In: Alexander Lubotsky (ed.): Sound Law and Analogy: Papers in Honor of Robert S.P. Beekes. Leiden: Rodopi.

18 Schrijver, Petrus Cornelis Hendrikus (2000): “Non-Indo-European Surviving in Ireland in the First Millennium AD”. Ériu 51. 195–199.

19 Willms, Lothar (2013): Klassische Philologie und Sprachwissenschaft. Göttingen: Vandenhoeck and Ruprecht.

20 Witzel, Michael (1999): “Substrate Languages in Old Indo-Aryan (Rgvedic, Middle and Late Vedic)”. Electronic Journal of Vedic Studies 5, no. 1. 1–67.

21 Witzel, Michael (2006): “Early Loan Words in Western Central Asia, Indicators of Substrate Populations” In: Victor Mair (ed.): Contact and Exchange in the Ancient World. Honolulu: University of Hawai'i Press. 158–190.