Artikel Jurnal
Hammer, Bjarne
Roads, 2014
Buku Referensi
Design Media Publishing Limited, 2010
Buku Referensi
Departemen of Comunication & Indormation Technology,
Majalah, Jurnal, Buletin
Darwis [Tere Liye], 1979-
Gramedia Pustaka Utama, 2017
Buku Teks SO