Kelsen, Hans, author
Holt, Rinehart and Winston, 1967
Buku Teks
O`Connell, D. P., author
Stevens & Sons Limited, 1970
Buku Teks
Starke, J.G., author
Butterworth , 1958
Buku Teks
Wilson, George Graton, author
Oceana Publication, 1964
Buku Teks
Wright, Quincy, author
Asia Publishing House, 1960
Buku Teks