Bolland, Eric J., author
Emerald, 2017
eBooks
Farrell, Joyce, author
Course Technology Cengage Learning, 2013
Buku Teks
Saunders, Joy, author
Berlitz, 1993
Buku Teks
Levine, Robert I., author
McGraw-Hill, 1986
Buku Teks
Levine, Robert l., author
McGraw-Hill, 1988
Buku Teks