Gunther, John, 1901-1970, author
Hamish Hamilon, 1955
Buku Teks
Vashdev, Gobind, author
Noura Books, 2012
Buku Teks
Newby, Julian, 1957-, author
Routledge, 1997
Buku Teks
Sidhu, Gursharan S., author
Addison-Wesley, 1990
Buku Teks
edited by Charles Peters and James Fallows ; foreword by Richard H. Rovere
Frederick A. Praeger, 1976.
Buku Teks