McDonough, Carol
Addison-Wesley, 1985
Buku Teks
Hashim Ali, author
Oxford University Press, 1999
Buku Teks
by Laurel Eisenhaur...[et.al.]
Lippincott , 1998
Buku Teks
Johnson, Joyce Young, author
J.B. Lipincott, 2003
Buku Teks
Auerbach Publisher, 1975
Buku Referensi