Tony Elger, Chris Smith, editor
Routledge, , 2011.
Buku Teks
Carsrud, Alan L., author
Springer, 2011
eBooks
by W. Earl Sasser [and others]
Richard D. Irwin, 1982
Buku Teks
by W. Earl Sasser [and others]
Richard D. Irwin, 1982
Buku Teks
Batty, J
The English Languange Book Society, 1979
Buku Teks