Dave Christian
Analisis semiotika dan semantik meme berbahasa Jerman yang menyiratkan depresi dalam laman Facebook stramme memes für deutsche teens = Semiotic and semantic analysis of German-language memes implying depression on Facebook page stramme memes für deutsche teens
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2018
 UI - Skripsi Membership
Taglianonte, Sali A.
Variationist sociolinguistics : change, observation, interpretation
Wiley-Blackwell, 2012
 Buku Teks
Wilkes, Angela
German for beginners
Chicago: A Division of NTC Pub., 1987,
 Buku Referensi
Coggle, Paul
Complete German, volume 2 = Teach yourself German
Kesaint Blanc, 2011
 Buku Teks
McKeane, Alasdair
German
Longman, 1994
 Buku Teks