edited by George A. Vanasse
Academic Press, 1981
Buku Teks
Radhakrishnan, Sarvepalli, 1888-1975, author
Macmillan, 1951
Buku Teks
Owen, George E., author
Harper and Row, 1967
Buku Teks
Bremmelen, R.W. Van
Martinus Nijhoff, 1970
Buku Referensi
Butterworth-Heinemann, 2013
eBooks