Nasution, E. et al. 2022. Stereotype and abnormal behaviour in Macaca fascicularis captive: Towards good environmental enrichment for its sustainability. JURNAL RISET RUMPUN ILMU HEWANI. 1, 2 (Oct. 2022), 42–51. DOI:https://doi.org/10.55606/jurrih.v1i2.551.