Reid, J. H. Stewart
Longmans, Green and Co. , 1959
Buku Teks
Beck, Roger, author
Blackwell Publishing, 2007
Buku Teks
Windelband, Wilhelm, author
Dover, 1956
Buku Teks
Vernadsky, George
Yale University Press, 1954
Buku Teks
Satyawati Sulaiman, author
Archaeological Foundation, [date of publication not identified]
Buku Teks