Kennedy, X.J.
Harper Collins College, 1991
Buku Teks
Kennedy, X.J.
Harper Collins, 1991
Buku Referensi
Hall, Donald
Holt, Rinehart and Winston, 1981
Buku Teks
edited by Sylvan Barnet ... [et al.]
Longman, 2003
Buku Teks
Kennedy, X.J.
Pearson, 2016
Buku Teks SO