Routledge, 2004
Buku Teks
Fjeldstad, Mary C., author
Harcourt Brace College Publisher, 1998
Buku Teks
edited, and with an introd. by Susan
Hill and Wang, 1982
Buku Teks
Benet, William Rose, author
Thomas Y. Crowell, 1965
Buku Referensi
McGraw-Hill Education, 2016
Buku Teks