edited by Nigel Wheale
Routledge , 1995
Buku Teks SO
Partlow, Robert B.
Prentice-Hall, 1963
Buku Teks SO
edited by Nigel Wheale
Routledge, 1995
Buku Teks
German Studies,
Majalah, Jurnal, Buletin
program consultants, Beverly Ann Chin ... [et al.]
Glencoe McGraw-Hill, 2000
Buku Teks SO