Godel, Robert
Geneve Imprimerie H. Studer S.A. 1957
Buku Teks
Geneve : Librairie Droz
Majalah, Jurnal, Buletin
Saussure, Ferdinand de, author
Boulevard Saint Germain , 1949
Buku Teks
Paris : Didier
Majalah, Jurnal, Buletin
Brondal, V.
Kopenhagen Munksgaard 1943
Buku Teks