Bill Freedman, editor
Springer Reference, 2014
Buku Teks
Colin D. Butler, editor
CABI, 2016
Buku Teks
edited by William D. Simonson, D.A. Coomes, David F.R.P. Burslem
Cambridge University Press, 2014
Buku Teks
Harvey, L.D. Danny, author
Prentice-Hall, 2000
Buku Teks
Nainggolan, Hotman Saut, author
Fakultas Eknonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis (Open)