Lefebvre, Henri, author
University of Minnesota Press, 2003
Buku Teks
Carter, Harold, author
Longman, 1990
Buku Teks
Berry, Brian J.L., author
Prentice-Hall, 1970
Buku Teks
edited by D. T. Herbert and R. J. Johnston
John Wiley & Sons, 1981
Buku Teks
Taylor, Griffith, author
Methuen, 1951
Buku Teks