Mayer, Frederick, author
American Book Company, 1950
Buku Teks
Barry Lee, editor
Continuum International Pub. Group, 2011
Buku Teks
Storey, Ian Christopher, 1946-, author
Wiley Balckwell, 2014
Buku Teks
Rose, H.J.
Hutchinson's University Library , [date of publication not identified]
Buku Teks
Edinburgh, Edinburgh University Press, 2005
Buku Referensi