Tomkinson, Ray, author
Routledge, 2016
eBooks
Curry, William Sims, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
CRC Press, Taylor & Francis , 2009
Multimedia
Gustafsson, Agne
Swedish Institute, 1983
Buku Teks
Allen & Unwin, 1950
Buku Teks