Eric Freedman, Robyn S. Goodman, and Elanie Steyn, editors
Routledge, Taylor & Francis Group, 2018
Buku Teks
Caselli, Marco
Springer, 2012
eBooks
Burton, Graeme, author
McGraw-Hill, 2010
Buku Teks
edited by: John Halligan and Chris Paris
Longman Chesire, 1984
Buku Teks
edited by Robert Dickinson ... [and others]
Cambridge University Press, 2012
Buku Teks