Copy and paste this link:
http://journals.cambridge.org/action/displayAbstract?aid=616744
Copy and paste this citation
Chris Sandbrook
and Stuart Semple
(2006).
The rules and the reality of mountain gorilla Gorilla beringei beringei tracking: how close do tourists get?. Oryx, 40
,
pp 428-433
doi:10.1017/S0030605306001323