Bismark, M. (1980). Populasi dan tingkahlaku bekantan (Nasalis larvatus) di Suaka Margasatwa Tanjung Puting, Kalimantan Tengah =: Behaviour and population density of proboscis moneky (Nasalis larvatus) at Tanjung Puting Game Reserve, Central Kalimantan. Lembaga Penelitian Hutan.

Bismark, M. Populasi Dan Tingkahlaku Bekantan (Nasalis Larvatus) Di Suaka Margasatwa Tanjung Puting, Kalimantan Tengah =: Behaviour and Population Density of Proboscis Moneky (Nasalis Larvatus) at Tanjung Puting Game Reserve, Central Kalimantan. Bogor: Lembaga Penelitian Hutan, 1980.

Bismark, M. Populasi Dan Tingkahlaku Bekantan (Nasalis Larvatus) Di Suaka Margasatwa Tanjung Puting, Kalimantan Tengah =: Behaviour and Population Density of Proboscis Moneky (Nasalis Larvatus) at Tanjung Puting Game Reserve, Central Kalimantan. Lembaga Penelitian Hutan, 1980.