Copy and paste this citation
Marc Ancrenaz,
Benoit Goossens,
Olivier Gimenez,
Azri Sawang
and Isabelle Lackman-Ancrenaz
(2004).
Determination of ape distribution and population size using ground and aerial surveys: a case study with orang-utans in lower Kinabatangan, Sabah, Malaysia. Animal Conservation,
7
,
pp 375-385
doi:10.1017/S136794300400157X