R. A. W. Rhodes [and others]
Open University press, 2003
Buku Teks
University of Tokyo Press, 1977
Buku Teks
George Allen and Unwin, 1982
Buku Teks
Johnston, R.J. (Ronald John), author
Routledge, 2016
Buku Teks
Gregg, Pauline, author
George G. Harrap, 1967
Buku Teks