Johnson, Elmer D., author
The Scarecrow Press, 1970
Buku Teks
Palmer, R.R. (Robert Roswell), 1909-2002, author
McGraw-Hill, 1950
Buku Teks
London Chancellor Press 1999,
Buku Referensi
Philips, author
Chancellor Press, 1999
Buku Referensi
Nehru, Jawaharlal, 1889-1964, author
Oxford University Press , 1988
Buku Referensi