Brown, Tim
Wiley Blackwell, 2010
Buku Teks
Andrews, Gavin J., 1970-
Routledge, Taylor & Francis Group, 2018
Buku Teks
edited by Pavlos Kanaroglou, Eric Delmelle and Antonio Páez
Routledge, 2018
Buku Teks
Taylor and Francis, 2018
Buku Teks
edited by Alastair Gray
Open University Press, 2001
Buku Teks