Vermeulen, J. W. Charlotte <br/><br/>
Feeding ecology of Javan Pond Ardeola speciosa and Cattle Egret Bubulcus ibis in North Sulawesi, Indonesia, with additional notes on the occurrence of ardeids / 
J.W. Charlotte Vermeulen & Arie L. Spaans 
 - Arnhem :  Research Institute for Nature Management,  1987 
 - 37 p. :  ill. ;  30 cm 
 - RIN contributions to research on management of natural resources ;  1987-2 .
<br/><br/>References: p. 31-32 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Herons--Indonesia<br/>Cattle egret--Indonesia