Kaplan, Gisela. Orang-utans in Borneo Gisela Kaplan and Lesley Rogers; photography by Gisela Kaplan. - Kota Kinabalu SRS Enterprise 1994. - xii, 196 p. : ill. ; 26 cm. p. 163-190. ISBN: 1875821139 RM36.22 Subjects--Topical Terms: Orangutan--Borneo.