Downs, Anthony
Little, Brown and Co., 1967
Buku Teks
Gunther, John, 1901-1970, author
Harper & Brothers, 1942
Buku Teks
Gunther, John, 1901-1970, author
Hamish Hamilon, 1955
Buku Teks
Gunther, John, 1901-1970
Hamish Hamilton, 1939
Buku Referensi
Vashdev, Gobind, author
Noura Books, 2012
Buku Teks