Wanker, R.; Sugama, Y.; Prinage, S. (July 2005). "Vocal labelling of family members in spectacled parrotlets, Forpus conspicillatus". Animal Behaviour. 70: 111–118. doi:10.1016/j.anbehav.2004.09.022. S2CID53158653.
Wanker, R.; Sugama, Y.; Prinage, S. (July 2005). "Vocal labelling of family members in spectacled parrotlets, Forpus conspicillatus". Animal Behaviour. 70: 111–118. doi:10.1016/j.anbehav.2004.09.022. S2CID53158653.