Lua APA (7ú heag.)
Weltens, H. H. (1989). The attrition of French as a foreign language. Foris Publications.
Lua i Stíl Chicago (17ú heag.)
Weltens, Hubertus H. The Attrition of French as a Foreign Language. Dordrecht [The Netherlands]: Foris Publications, 1989.
Lua MLA (9ú heag.)
Weltens, Hubertus H. The Attrition of French as a Foreign Language. Foris Publications, 1989.
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