Friedrich, Carl J., author
Frederick A. Praeger, 1962
Buku Teks
Goodman, Craufurd D., author
Institute of International Education, 1966
Buku Teks
Spengler, Oswald, author
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, author
Everyman's Library, 1993
Buku Teks