Yapp, R.H, author
University Press, 1927
Buku Teks
Smith, E Evelyn
London JM Dent & Sons 1945
Buku Teks
Artikel Jurnal
Jones, Vincent
Summy-Birchard Publishing Company, 1941
Buku Teks
Hendro Purnomo, author
Universitas Indonesia, 2012
UI - Tesis Open