Wachters, H.J.J.
AD.M.C. Stok, [date of publication not identified]
Buku Teks
Keylor, William R., 1944-, author
Oxford University Press, 1996
Buku Teks
Salem Press , 1992
Buku Referensi
Salem Press , 1992
Buku Referensi
Salem Press , 1992
Buku Referensi