Wadsworth, Barry J.
Longman , 1971
Buku Teks
edited by Frank B. Murray
University Park Press, 1979
Buku Teks
Vitri Mardiati, author
2018
UI - Skripsi (Membership)
Driscoll, Marcy P, author
Pearson Allyn and Bacon, 2005
Buku Teks
Mutiara Aisha Maghfira, author
2018
UI - Skripsi (Membership)