Rawlison, H.G.
Frederick A Praeger, 1952
Buku Teks
The Kanada Press, 1953
Buku Teks
Taylor, Edmond
Houghton Miffiln, 1947
Buku Teks
Kumar, Nirmal, author
Bharatiya Vidya Bhavan, 1979
Buku Teks
Sartori, Andrew, 1969-, author
Univercity of Chicago Press, 2008
Buku Teks