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1989
UI - Tesis (Membership)
Haugen, Einar
Stanford University Press, 1972
Buku Teks
FSUI, 1990
Buku Teks
edited by Ulrich Ammon, Norbert Dittmar, Klaus J. Mattheier
Walter de Gruyter, 1987
Buku Referensi
edited by Ulrich Ammon, Norbert Dittmar, Klaus J. Mattheier
Walter de Gruyter, 1988
Buku Referensi