Smith, William George, compiler
Clarendon Press, 1952
Buku Referensi
McAlpin, Janet, author
England: Longman Group, 1988,
Buku Referensi
Bambang Wiharto, author
Universitas Kristen Maranatha. Fakultas Ekonomi; Universitas Kristen Satya Wacana. Fakultas Ekonomi, 2009
Artikel Jurnal
J. K. Moorhead, Charles Lee, editor
J.M. Dent and Sons , 1932
Buku Referensi
Browning, D. C.
J.M. Dent , 1951
Buku Referensi