by Mary M. Lay [and others]
Irwin, 1995
Buku Teks
Roze, Maris, author
Prentice-Hall, 2002
Buku Teks
Eisenberg, Anne, author
McGraw-Hill, 1992
Buku Teks
Sides, Charles H., 1952-, author
Cambridge University Press, 1992
Buku Teks
Davies, John W, author
Prentice-Hall, 2001
Buku Teks