Scales, Peter, 1949-, author
Open University Press, 2013
Buku Teks
Delphin, Patricia
Virgnia Reston publishing 1983 , 1983
Buku Teks
Livingstone, D.W.
Sense, 2012
eBooks
Emerald Publishing Limited, 2019
eBooks
Wilson, John A. R., author
McGraw-Hill, 1974
Buku Teks