Widowati, R., W. Sjamsuridzal, A. Basukriadi, A. Oetari, E. Anwar, `V. Enfinali, E. A. Rismawanti, and B. A. Luhur. 2011. “Preference of Apis Cerana to Six Pollen Substitutes”. Proceeding ICBB (The International Conference on Bioscience and Biotechnology) 1 (1):B65-B65. http://www.sunankalijaga.org/prosiding/index.php/icbb/article/view/170.