Silaban, Rumata Marsaulina, author
Fakultas Ilmu Komputer Universitas Indonesia, 2017
UI - Tugas Akhir
Langefors, Borje, author
Petrocelli/Charter, 1975
Buku Teks
Heany, Donald F., author
Ronald Press, 1968
Buku Teks
Doyle, Lauren B., author
John Wiley & Sons, 1975
Buku Teks
Megarry, Jacquetta, author
British Broadcasting Corporation, 1985
Buku Teks