Jaak Panksepp & J. Burgdorf: 50k-Hz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats:. Behavioral Brain research, October 2000, 115. vsk, nro 1, s. 25–38. PubMed:10996405doi:10.1016/s0166-4328(00)00238-2(englanniksi)
Jaak Panksepp: A neurochemical theory of autism. Trends in Neurosciences, 1979, 2. vsk, s. 174–177. doi:10.1016/0166-2236(79)90071-7(englanniksi)(englanniksi)
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Jaak Panksepp Deck-Hanneman Funeral Home & Crematory. Viitattu 20.4.2017. (englanniksi)
Jaak Panksepp & J. Burgdorf: 50k-Hz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats:. Behavioral Brain research, October 2000, 115. vsk, nro 1, s. 25–38. PubMed:10996405doi:10.1016/s0166-4328(00)00238-2(englanniksi)