McCall, John
Monarch Press, 1966
Buku Teks
Audrey Gabriella Titaley, author
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2018
UI - Tesis (Membership)
Leki, Ilona
Cambridge University Press, 1998
Buku Teks
Meyers, Alan, 1945-, author
Pearson Education, 2014
Buku Teks
Kent, Sherman
Appleton Century Croffs, 1967
Buku Teks