Caiden, Naomi, author
John Wiley & Sons, 1974
Buku Teks
Frederick A. Praeger, 1966
Buku Teks
Trebilcock, Michael, author
Edward Elgar, 2011
Buku Teks
Rostow, Walt Whitman, author
Westview Press, 1987
Buku Teks
Khalid, Rasheed O.
S l. : s.n., 1967,
Buku Teks