edited by Nigel Cross, David Elliott and Robin Roy
Hutchinson Educational , 1974
Buku Teks
Andita Dwiyoga Tahitoe
Fakultas Ilmu Komputer Universitas Indonesia, 2021
UI - Tugas Akhir
Artikel Jurnal
edited by Joan Broadhurst Dixon and Eric J. Cassidy
Routledge, 1998
Buku Teks
Elsevier Science Inc., 660, 2018
Majalah, Jurnal, Buletin