David, Rene, 1906-
Stevens & sons, 1985
Buku Teks
Erades, Judge
Martinus Nijhoff Publishers, 1983
Buku Teks
Fox, James R.
Oceana Publication, 1992
Buku Referensi
Roux, Theunis
Cambridge University Press, 2018
eBooks
Roux, Theunis
Cambridge University Press, 2018
eBooks