Graham, Martha
Harwood Academic Publisher , 1999
Buku Teks
Safrini Malahayati, author
2010
UI - Skripsi Open
Zacharias, L.J.H., author
Kementrian Pendidikan dan Kebudayaan, 2012
Buku Teks
Liong, Theresa C. Y. (Theresa Catharina Ying), 1941-, author
Kompas, 2010
Buku Teks
Waite, Helen Elmira
Macrae Smith Company, 1961
Buku Teks