Schumm, Jeanne Shay
The reading tutor;s handbook: a commonsense guide to helping students read and write
Freespirit Publishing, 1999
 Buku Referensi
Dawe, Charles W.
One to one : resources for confrence-centered writing/Charles W.Dawe
Little, Brown and Company, c1984
 Buku Teks
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
Intelligent tutoring systems: at the crossroad of artificial intelligence and education
edited by Claude Frasson, Gilles Gauthier
Ablex, 1990
 Buku Teks