1972, The Hague Mouton
Buku Teks
The Hague, 1972
Buku Teks
Fishman, Joshua A., author
Newbury House Publishers, 1972
Buku Teks
Penguin Books, 1974
Buku Teks
edited by Ulrich Ammon, Norbert Dittmar, Klaus J. Mattheier
Walter de Gruyter, 1987
Buku Referensi