Saunders, Joy, author
Berlitz, 1993
Buku Teks
Saunders, Joy, author
Pearson Education, 1994
Buku Teks
Lenk, John D., author
Reston , 1978
Buku Referensi
Hamilton, T.D.S., author
McGraw-Hill, 1977
Buku Referensi
Hamilton, T.D.S., author
McGraw-Hill, 1977
Buku Referensi