Gaya APA

Wibowo, P. et al (1999). White-Winged Duck (Cairina Scutulata) Survey in North Sumatra: A Survey Report Based on A White-Winged Duck Wide-survey in North Sumatra, July-August 1999 . : Wetlands International.

Gaya MLA

Wibowo, P.. et al. "White-Winged Duck (Cairina Scutulata) Survey in North Sumatra: A Survey Report Based on A White-Winged Duck Wide-survey in North Sumatra, July-August 1999". : Wetlands International, 1999. Text.