Fischer, Fritz
W. W. Norton, 1974
Buku Teks
Goodman, Craufurd D.
Institute of International Education, 1966
Buku Teks
Spengler, Oswald
George Allen and Unwin, 1956
Buku Teks
Ronald Van Kempen; Gideon Bolt; Maarten Van Ham, editors
Routledge, Taylor & Francis Group, 2018
Buku Teks
Waugh, Evelyn, 1903-1966
Everyman's Library, 1993
Buku Teks