Sardiman, author
Ombak, 2008
Buku Teks
UNIC, [date of publication not identified]
Buku Teks
Myrdal, Gunnar, 1898-, author
Gramedia, 1980
Buku Teks
B.M. Ichwan, author
Erlangga, 1959
Buku Teks
Kantor Penerangan Perserikatan Bangsa-Bangsa
Kantor Penerangan Perserikatan Bangsa-bangsa, 1993
Buku Teks