Schumm, Jeanne Shay
The reading tutor;s handbook: a commonsense guide to helping students read and write
Freespirit Publishing, 1999
 Buku Referensi
Sari Widya Sihwi
Penerapan bayesian network student model pada intelligent tutoring system
Fakultas Ilmu Komputer Universitas Indonesia, 2005
 UI - Skripsi Membership
Dawe, Charles W.
One to one : resources for confrence-centered writing/Charles W.Dawe
Little, Brown and Company, c1984
 Buku Teks SO
Wiwik Wahyuni
Keputusan rumah tangga dalam membayar les privat anak = Household's decisions on paying of childs private tutoring / Wiwik Wahyuni
Universitas Indonesia, 2017
 UI - Tesis Membership
Christie, Agatha, 1890-1976
Buku catatan Josephine = Crooked house
Gramedia Pustaka Utama, 2018
 Buku Teks SO