Rusfidra et al. 2014. Characterization of Number of Crow and Qualitative Marker of Kokok Balenggek Song Fowl Inside a Captive Breeding Farm in Solok Regency, West Sumatera Province, Indonesia. International Journal of Poultry Science. 13, 6 (May 2014), 343–346. DOI:https://doi.org/10.3923/ijps.2014.343.346.