Ball, Rodney
The French-speakingg world: a pratical introduction to sociolinguistic issues
Routledge, 1997
 Buku Teks SO
Coultas, Barbara
Business French : a complete course for beginners
Teach Yourself Books, 1990
 Buku Teks SO
Bower, Malcolm
French for business / Malcolm Bower and Lucette Barbarin
Hodder & Stoughton, 1977
 Buku Teks
Lewis, Benny
Language Hacking French : Percakapan untuk pemula
Kesaint Blanc, 2023
 Buku Teks
Barbour, Stephen
Variation in German: a critical approach to German sociolinguistics
Cambridge [England]; New York Cambridge University Press 1990,
 Buku Teks