Andrew Horrocks, Clyde & Co LLP, editor
Thomson Reuters, 2011
Buku Teks
Braucher, Robert, author
Foundation Press, 1953
Buku Teks
Braucher, Robert, author
Foundation Press, 1964
Buku Teks
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Redmond, Peter W. D., author
The M & E Handbook Series, 1993
Buku Teks