Rockport , 1995
Buku Teks
Hewes ,Rachel, author
Rockport Publishers, 2010
Buku Referensi
Rizki Aulia Syahrizal, author
2016
UI - Skripsi Membership
Azka Amalia, author
2018
UI - Skripsi Membership
Abelson, Harold, author
Byte/McGraw-Hill, c1982
Buku Teks