Delaney, David, author
Blackwell Publishing, 2005
Buku Teks
Tim, Cresswell, author
Wiley , 2015
Buku Teks
Lebon, J. H. G., author
Hutchinson University Library, 1969
Buku Teks
Barcus, Holly R., author
Routledge, 2018
Buku Teks
Jonas, Andrew E. G, author
Wiley-Blackwell, 2015
Buku Teks