Landis, Paul H.
Ginn and Company, 1961
Buku Teks
Perlman, Mark, author
Macmillan, 1974
Buku Teks
Alexander, Linda Lewis, author
Jones & Bartlett Learning, 2014
Buku Teks
Albrecht, Gary L.
Connecticut JAI Press, 1994
Buku Teks
Puspa Damai Asri, author
2015
UI - Skripsi (Membership)