Febri Ivana, author
UNDP, [ tt ]
Buku Referensi
Febrian, author
United Nations Development Programme (UNDP), 2009
Buku Teks
Davies, Jack
West Group, 1986
Buku Teks
Davies, Jack, author
West Publishing, 1975
Buku Teks
Morris S.Ogul
Prentice-Hall, 1977
Buku Teks