Frost, Nollaig, author
McGraw-Hill, 2011
Buku Teks
Frost, Nollaig, author
Open University Press, 2011
Buku Teks
Neuman, William Lawrence, 1950-, author
Allyn and Bacon, 1994
Buku Teks
Neuman, William Lawrence, 1950-, author
Pearson/Allyn and Bacon, 2006
Buku Teks
Neuman, William Lawrence, 1950-, author
Allyn and Bacon, 2003
Buku Teks