Schumm, Jeanne Shay
Freespirit Publishing, 1999
Buku Referensi
Sari Widya Sihwi
Fakultas Ilmu Komputer Universitas Indonesia, 2005
UI - Skripsi (Membership)
Dawe, Charles W.
Little, Brown and Company, c1984
Buku Teks
Wiwik Wahyuni
Universitas Indonesia, 2017
UI - Tesis (Membership)
Christie, Agatha, 1890-1976
Gramedia Pustaka Utama, 2018
Buku Teks