Kenen, Peter B., author
Pustaka Universitas, 1982
Buku Teks
Dewey, Alice G., author
The Free Press, 1962
Buku Teks
S. Husin Ali, author
Oxford University Press, 1975
Buku Teks
ILO, 1974
Buku Teks
Dewey, Alice G., author
The Free Press, 1962
Buku Teks