Elisa Morgera, Kati Kulovesi
Edward Elgar, 2016
Buku Teks
Edited by Xandra Kramer, Laura Carballo Piñeiro
Edward Edgae Publishing, 2024
Buku Teks SO
edited by Merlin C. Wittrock; a project of the American Educational Research Association
Macmillan Library Reference USA, 1986
Buku Referensi
Canobbio, Mary M.
Mosby, 1996
Buku Teks SO
Canobbio, Mary M.
Mosby Elsevier, 2006
Buku Referensi