Barbara Kroll, editor
Cambridge University Press, 2003
Buku Teks
Knickerbocker, K.L. (Kenneth Leslie)
Holt, Rinehart and Winston, 1956
Buku Teks
Knickerbocker, K.L. (Kenneth Leslie)
Holt, Rinehart and Winston, 1956
Buku Teks
Artikel Jurnal
Martin, J. R.
Oxford University Press , 1989
Buku Teks